criyle/codenet-compile-errors huggingface dataset:
Language: Java

   import java.util.*;    
public class main{
      public static void main(String []args){
        Scanner sc = new Scanner(System.in);
        char a = sc.next().charAt(0);
        if (Character.isUpperCase(a)){
    		System.out.println('A');
        }
        else{
          System.out.println('a');
        }
      }
    }

Compiler output:
Main.java:2: error: class main is public, should be declared in a file named main.java
public class main{
       ^
1 error
Language: Java

public class main{
  public static void main(String []args){
    Scanner sc = new Scanner(System.in);
    char a = sc.nextLine();
    if (Character.isUpperCase(a)){
		System.out.println('A');
    }
    else{
      System.out.println('a');
    }
  }
}

Compiler output:
Main.java:1: error: class main is public, should be declared in a file named main.java
public class main{
       ^
Main.java:3: error: cannot find symbol
    Scanner sc = new Scanner(System.in);
    ^
  symbol:   class Scanner
  location: class main
Main.java:3: error: cannot find symbol
    Scanner sc = new Scanner(System.in);
                     ^
  symbol:   class Scanner
  location: class main
3 errors
Language: C++

#include<bits/stdc++.h>
int main()
{
  char ch;
  cin>>ch;
  if(isupper(ch))
    cout<<"A";
  else
    cout<<"a";
  return 0;
} 
  

Compiler output:
a.cc: In function 'int main()':
a.cc:5:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    5 |   cin>>ch;
      |   ^~~
      |   std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146,
                 from a.cc:1:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:7:5: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    7 |     cout<<"A";
      |     ^~~~
      |     std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:9:5: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    9 |     cout<<"a";
      |     ^~~~
      |     std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
Language: C++

#include <iostream>
#include <vector>
#include <algorithm>
#include <map>
#include <queue>
#define REP0(i,n) for((i)=0;(i)<(int)(n);(i)++)
#define REP1(i,n) for((i)=1;(i)<=(long long)(n);(i)++)
#define ll long long
using namespace std;

ll i,j,k;
const ll MOD = 1000000000 + 7;

int main(){
    ll n,m;
    char a;
    cin>>a;
    
    
    if(a>='A' && a<='Z'){
        cout<<'A'<<'\n'
    }
    else{
        cout<<'a'<<'\n';
    }
    
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:21:24: error: expected ';' before '}' token
   21 |         cout<<'A'<<'\n'
      |                        ^
      |                        ;
   22 |     }
      |     ~
Language: C++

#i = list(map(str, input().split()))
i = input()
if i.isupper():
    print('A')
else:
    print('a')

Compiler output:
a.cc:1:2: error: invalid preprocessing directive #i; did you mean #if?
    1 | #i = list(map(str, input().split()))
      |  ^
      |  if
a.cc:2:1: error: 'i' does not name a type
    2 | i = input()
      | ^
Language: C++

#include <bits/stdc++.h>

using namespace std;
using ll =long long;
typedef pair<int,int> P;
#define SORT(a) sort((a).begin(),(a).end())
#define rSORT(a) reverse((a).begin(),(a).end())
#define For(i, a, b)    for(int i = (a) ; i < (b) ; ++i)
#define rep(i, n)       For(i, 0, n)
#define debug(x)  cerr << #x << " = " << (x) << endl;
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; }
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; }
//Write From this Line

int main()
{
	char c;
	cin >> c;
	if(is_lower(c)){
		cout << 'a' << endl;
	} else {

		cout << 'A' << endl;
	}
}


Compiler output:
a.cc: In function 'int main()':
a.cc:19:12: error: 'is_lower' was not declared in this scope; did you mean 'iswlower'?
   19 |         if(is_lower(c)){
      |            ^~~~~~~~
      |            iswlower
Language: C++

#include <stdio.h>
#include <iostream>
#include <map>
#include <vector>
#include <string>
#include <algorithm>
#include <cmath>
#include <regex>




int main() {
   
	char s;
	cin >> s;
	if ('A' <= s && s < 'a')
	{
		cout << 'A';
	}
	else {
		cout << 'a';
	}
	//printf("A:%d a:%d", 'A', 'a');

	
	
	return 0;
	
}


Compiler output:
a.cc: In function 'int main()':
a.cc:16:9: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
   16 |         cin >> s;
      |         ^~~
      |         std::cin
In file included from a.cc:2:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:19:17: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   19 |                 cout << 'A';
      |                 ^~~~
      |                 std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:22:17: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   22 |                 cout << 'a';
      |                 ^~~~
      |                 std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main() {
  string s;
  cin >> s;
  vector<string> omoji;
  omoji = {"A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"};
  vector<string> komoji;
  komoji = {"a","b","c","d","e","f","g","h","i","j","K","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"};
  for (int i = 0;i < 26;i++) {
    if (s = omoji.at(i)){
      cout << "A" << endl;
    }
    else if (s = komoji.at(i)){
      cout << "a" << endl;
    }
  }
} 

Compiler output:
a.cc: In function 'int main()':
a.cc:11:11: error: could not convert 's.std::__cxx11::basic_string<char>::operator=((*(const std::__cxx11::basic_string<char>*)(& omoji.std::vector<std::__cxx11::basic_string<char> >::at(((std::vector<std::__cxx11::basic_string<char> >::size_type)i)))))' from 'std::__cxx11::basic_string<char>' to 'bool'
   11 |     if (s = omoji.at(i)){
      |         ~~^~~~~~~~~~~~~
      |           |
      |           std::__cxx11::basic_string<char>
a.cc:14:16: error: could not convert 's.std::__cxx11::basic_string<char>::operator=((*(const std::__cxx11::basic_string<char>*)(& komoji.std::vector<std::__cxx11::basic_string<char> >::at(((std::vector<std::__cxx11::basic_string<char> >::size_type)i)))))' from 'std::__cxx11::basic_string<char>' to 'bool'
   14 |     else if (s = komoji.at(i)){
      |              ~~^~~~~~~~~~~~~~
      |                |
      |                std::__cxx11::basic_string<char>
Language: C++

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
 
int main() {
	int n = 0;
	cin >> n;
	vector <int> vect(n);
	int sum = 0;
	for (int i = 0; i < n; i++)
	{
		cin >> vect[i];
		sum = sum + vect[i];
	}
	int q = 0;
	cin >> q;
	int t1 = 0;
	int t2 = 0;
	sort(vect.begin(),vect.end());
	for (int i = 0; i < q; i++)
	{
		cin >> t1 >> t2;
		for (int j = 0; j < vect.size();j++)
		{
			if (vect[j] == t1)
			{
				vect[j] = t2;
				sum = sum - t1 + t2;
			}
		}
		cout << sum << endl;
	}
	return 0;
}
#include <iostream>
#include <vector>
#include <alogrithm>
using namespace std;

int main() {
	int n = 0;
	cin >> n;
	vector <int> vect(n);
	int sum = 0;
	for (int i = 0; i < n; i++)

Compiler output:
a.cc:38:10: fatal error: alogrithm: No such file or directory
   38 | #include <alogrithm>
      |          ^~~~~~~~~~~
compilation terminated.
Language: Java

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner scan =new Scanner(System.in);
	String s=scan.next();
	char c=s.charAt(0);
		if(Character.isUpperCase(c))
		{
			System.out.println("A");
		}
		else if(Character.isLowerCase(c))
		{
			System.out.println("a");
		}
	}

Compiler output:
Main.java:17: error: reached end of file while parsing
	}
	 ^
1 error
Language: Java

import java.util.*;
import java.lang.*;
 
class Main{
	public static void main(String args[]){
    Scanner sc = new Scanner(System.in);
    char line = sc.next().toCharArray[0];
    if(Character.isLowerCase(line)){
    	System.out.println("a");
    	}
      else {
      	System.out.println("A");
      }
    }
}

Compiler output:
Main.java:7: error: cannot find symbol
    char line = sc.next().toCharArray[0];
                         ^
  symbol:   variable toCharArray
  location: class String
1 error
Language: Java

import java.util.*;
import java.lang.*;
 
class Main{
	public static void main(String args[]){
    Scanner sc = new Scanner(System.in);
    char line = sc.next();
    if(Character.isLowerCase(line)){
    	System.out.println("a");
    	}
      else {
      	System.out.println("A");
      }
    }
}

Compiler output:
Main.java:7: error: incompatible types: String cannot be converted to char
    char line = sc.next();
                       ^
1 error
Language: Java

import java.util.*;
import java.lang.*;
 
class Main{
	public static void main(String args[]){
    Scanner sc = new Scanner(System.in);
    String line = sc.next();
    if(Character.isLowerCase(line)){
    	System.out.println("a");
    	}
      else {
      	System.out.println("A");
      }
    }
}

Compiler output:
Main.java:8: error: no suitable method found for isLowerCase(String)
    if(Character.isLowerCase(line)){
                ^
    method Character.isLowerCase(char) is not applicable
      (argument mismatch; String cannot be converted to char)
    method Character.isLowerCase(int) is not applicable
      (argument mismatch; String cannot be converted to int)
1 error
Language: Java

import java.util.*;
import java.lang.*;

class Main{
	public static void main(String args[]){
    Scanner sc = new Scanner(System.in);
    if(Character.isLowerCase(sc)){
    	System.out.println("a");
    	}
      else {
      	System.out.println("A");
      }
    }
}

Compiler output:
Main.java:7: error: no suitable method found for isLowerCase(Scanner)
    if(Character.isLowerCase(sc)){
                ^
    method Character.isLowerCase(char) is not applicable
      (argument mismatch; Scanner cannot be converted to char)
    method Character.isLowerCase(int) is not applicable
      (argument mismatch; Scanner cannot be converted to int)
1 error
Language: Java

import java.util.*;

class Main{
	public static void main(String args[]){
    Scanner sc = new Scanner(System.in);
    if(Character.isLowerCase(sc)){
    	System.out.println("a");
    	}
      else {
      	System.out.println("A");
      }
    }
}

Compiler output:
Main.java:6: error: no suitable method found for isLowerCase(Scanner)
    if(Character.isLowerCase(sc)){
                ^
    method Character.isLowerCase(char) is not applicable
      (argument mismatch; Scanner cannot be converted to char)
    method Character.isLowerCase(int) is not applicable
      (argument mismatch; Scanner cannot be converted to int)
1 error
Language: C++

#include <bits/stdc++.h>
 
int main() {
  ios::sync_with_stdio(false);
  std::cin >> N;
  std::string str;
  while (N > 0) {
    str += 'a' + N % 26;
    N /= 26;
  }
  std::cout << str;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:4:3: error: 'ios' has not been declared
    4 |   ios::sync_with_stdio(false);
      |   ^~~
a.cc:5:15: error: 'N' was not declared in this scope
    5 |   std::cin >> N;
      |               ^
Language: C++

#include<bits/stdc++.h>
using namespace std;

int main(){
  char ch;
  cin>>ch;
  if(ispper(ch))
     cout<<"A";
  else
     cout<<"a";
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:6: error: 'ispper' was not declared in this scope; did you mean 'isupper'?
    7 |   if(ispper(ch))
      |      ^~~~~~
      |      isupper
Language: C++

#include<bits/stdc++.h>
using namespace std;

int main(){
  char ch;
  cin>>ch;
  if(isUpper(ch))
     cout<<"A";
  else
     cout<<"a";
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:6: error: 'isUpper' was not declared in this scope; did you mean 'isupper'?
    7 |   if(isUpper(ch))
      |      ^~~~~~~
      |      isupper
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  string a;
  cin >> a;
  if (isupper(a)) cout << "A" << endl;
  else cout << "B" << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:14: error: no matching function for call to 'isupper(std::string&)'
    7 |   if (isupper(a)) cout << "A" << endl;
      |       ~~~~~~~^~~
In file included from /usr/include/c++/14/bits/basic_ios.h:37,
                 from /usr/include/c++/14/ios:46,
                 from /usr/include/c++/14/istream:40,
                 from /usr/include/c++/14/sstream:40,
                 from /usr/include/c++/14/complex:45,
                 from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127,
                 from a.cc:1:
/usr/include/c++/14/bits/locale_facets.h:2631:5: note: candidate: 'template<class _CharT> bool std::isupper(_CharT, const locale&)'
 2631 |     isupper(_CharT __c, const locale& __loc)
      |     ^~~~~~~
/usr/include/c++/14/bits/locale_facets.h:2631:5: note:   candidate expects 2 arguments, 1 provided
In file included from /usr/include/c++/14/cctype:42,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:35:
/usr/include/ctype.h:117:1: note: candidate: 'int isupper(int)'
  117 | __exctype (isupper);
      | ^~~~~~~~~
/usr/include/ctype.h:117:1: note:   no known conversion for argument 1 from 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'int'
  117 | __exctype (isupper);
      | ^~~~~~~~~
Language: C++

#include <iostream>

int main(){
	char x;
	cin >> x;

	if (x >= 'A' and x <= 'Z'){
		cout << 'A';
	}else{
		cout << "a";
	}
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:9: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    5 |         cin >> x;
      |         ^~~
      |         std::cin
In file included from a.cc:1:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:8:17: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    8 |                 cout << 'A';
      |                 ^~~~
      |                 std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:10:17: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   10 |                 cout << "a";
      |                 ^~~~
      |                 std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
Language: C++

#include <iostream>
using namespace std;
int main(){
  	char c;
  	cin>>c;
 	if ('A'<=c && c<='Z'){
     	cout<<'A'<<endl;
    }
  	else cout<<'a'
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:23: error: expected ';' before '}' token
    9 |         else cout<<'a'
      |                       ^
      |                       ;
   10 | }
      | ~
Language: C++

#include <iostream>
using namespace std;
int main(){
 	if ('A'<=c && c<='Z'){
     	cout<<'A'<<endl;
    }
  	else cout<<'a'
}

Compiler output:
a.cc: In function 'int main()':
a.cc:4:18: error: 'c' was not declared in this scope
    4 |         if ('A'<=c && c<='Z'){
      |                  ^
a.cc:7:23: error: expected ';' before '}' token
    7 |         else cout<<'a'
      |                       ^
      |                       ;
    8 | }
      | ~
Language: C++

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
ll mod = 1000000007;
#define f first
#define s second
#define ss string
#define mp make_pair
#define pb push_back
#define p pair<int, int>
#define pp pair<int, p>
#define v vector<int>
#define vl vector<ll>
#define vb vector<bool>
#define vs vector<string>
#define vp vector<p>
#define vpp vector<pair<int, p>>
#define vv vector<v>
#define vvl vector<vl>
#define vvp vector<vp>
#define rep(i, n) for(int i = 0; i < (n); ++i)
#define repa(i, a, n) for(int i = a; i <= (n); ++i)
#define repd(i, n) for(int i = n; i >= 0; --i)
#define all(x) (x).begin(), (x).end()

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    char a;
  	cin >> a;
  if(a >= 'a' && a <= 'z'){
  cout << 'a';
  }
  else{
    cout << 'A';
    return 0;
}   

Compiler output:
a.cc: In function 'int main()':
a.cc:39:2: error: expected '}' at end of input
   39 | }
      |  ^
a.cc:28:11: note: to match this '{'
   28 | int main(){
      |           ^
Language: C++

#include <iostream>
 
int main()
{
  	char alpha;
  	std::cin >> alpha;
  	if int(alpha) <= 90
      std::cout << 'A' << std::endl;
    else
      std::cout << 'a' << std::endl;
	return 0; 
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:12: error: expected '(' before 'int'
    7 |         if int(alpha) <= 90
      |            ^~~
      |            (
a.cc:9:5: error: 'else' without a previous 'if'
    9 |     else
      |     ^~~~
Language: C++

#include<iostream>
using namespace std;
int main()
{
  char k;
  cin >> k;
  if(isupper(k)){
    cout << "A" << endl;}
  else(){
    cout << "a" << endl;}
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:8: error: expected primary-expression before ')' token
    9 |   else(){
      |        ^
Language: C++

#include<iostream>
using namespace std;
int main()
{
  char k;
  cin >> k;
  if(isupper(k)){
    cout << "A" << endl;
  else(){
    cout << "a" << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:3: error: expected '}' before 'else'
    9 |   else(){
      |   ^~~~
a.cc:7:17: note: to match this '{'
    7 |   if(isupper(k)){
      |                 ^
a.cc:9:8: error: expected primary-expression before ')' token
    9 |   else(){
      |        ^
a.cc:11:2: error: expected '}' at end of input
   11 | }
      |  ^
a.cc:4:1: note: to match this '{'
    4 | {
      | ^
Language: C

#include<cstdio>
int main(){
  int ch=getchar();
  if('A'<=ch&&ch<='Z')puts("A");
  else puts("a");
}

Compiler output:
main.c:1:9: fatal error: cstdio: No such file or directory
    1 | #include<cstdio>
      |         ^~~~~~~~
compilation terminated.
Language: C++

#include <iostream>
#include <vector>
#include <alogrithm>
using namespace std;

int main() {
	int n = 0;
	cin >> n;
	vector <int> vect(n);
	int sum = 0;
	for (int i = 0; i < n; i++)
	{
		cin >> vect[i];
		sum = sum + vect[i];
	}
	int q = 0;
	cin >> q;
	int t1 = 0;
	int t2 = 0;
	sort(vect.begin(),vect.end());
	for (int i = 0; i < q; i++)
	{
		cin >> t1 >> t2;
		for (int j = 0; j < vect.size();j++)
		{
			if (vect[j] == t1)
			{
				vect[j] = t2;
				sum = sum - t1 + t2;
			}
		}
		cout << sum << endl;
	}
	return 0;
}

Compiler output:
a.cc:3:10: fatal error: alogrithm: No such file or directory
    3 | #include <alogrithm>
      |          ^~~~~~~~~~~
compilation terminated.
Language: C

#include <stdio.h>
int main(void)
{
  int m,n
  scanf("%d",&m);
  scanf("%d",&n);
  if{m==n}{
    printf("Yes");
}else printf("No");
  return 0;
}


Compiler output:
main.c: In function 'main':
main.c:5:3: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'scanf'
    5 |   scanf("%d",&m);
      |   ^~~~~
main.c:6:15: error: 'n' undeclared (first use in this function)
    6 |   scanf("%d",&n);
      |               ^
main.c:6:15: note: each undeclared identifier is reported only once for each function it appears in
main.c:7:5: error: expected '(' before '{' token
    7 |   if{m==n}{
      |     ^
      |     (
main.c:9:2: error: 'else' without a previous 'if'
    9 | }else printf("No");
      |  ^~~~
Language: Java

class Main {

    public static void main(String[] args) {

        Pattern upperCase = Pattern.compile("[A-Z]");
        Pattern lowerCase = Pattern.compile("[a-z]");
        System.out.println("Please input alphabet");
        Scanner sc = new Scanner(System.in);
        String input = sc.nextLine();
        System.out.println("Input alphabet is '" + input + "'.");

        Matcher upperMatcher = upperCase.matcher(input);
        Matcher lowerMatcher = lowerCase.matcher(input);

        if(upperMatcher.find()){
            System.out.println("A");
        }else if(lowerMatcher.find()){
            System.out.println("a");
        }
        sc.close();
    }
}


Compiler output:
Main.java:5: error: cannot find symbol
        Pattern upperCase = Pattern.compile("[A-Z]");
        ^
  symbol:   class Pattern
  location: class Main
Main.java:5: error: cannot find symbol
        Pattern upperCase = Pattern.compile("[A-Z]");
                            ^
  symbol:   variable Pattern
  location: class Main
Main.java:6: error: cannot find symbol
        Pattern lowerCase = Pattern.compile("[a-z]");
        ^
  symbol:   class Pattern
  location: class Main
Main.java:6: error: cannot find symbol
        Pattern lowerCase = Pattern.compile("[a-z]");
                            ^
  symbol:   variable Pattern
  location: class Main
Main.java:8: error: cannot find symbol
        Scanner sc = new Scanner(System.in);
        ^
  symbol:   class Scanner
  location: class Main
Main.java:8: error: cannot find symbol
        Scanner sc = new Scanner(System.in);
                         ^
  symbol:   class Scanner
  location: class Main
Main.java:12: error: cannot find symbol
        Matcher upperMatcher = upperCase.matcher(input);
        ^
  symbol:   class Matcher
  location: class Main
Main.java:13: error: cannot find symbol
        Matcher lowerMatcher = lowerCase.matcher(input);
        ^
  symbol:   class Matcher
  location: class Main
8 errors
Language: Java

class αlphabet {

    public static void main(String[] args) {

        Pattern upperCase = Pattern.compile("[A-Z]");
        Pattern lowerCase = Pattern.compile("[a-z]");
        System.out.println("Please input alphabet");
        Scanner sc = new Scanner(System.in);
        String input = sc.nextLine();
        System.out.println("Input alphabet is '" + input + "'.");

        Matcher upperMatcher = upperCase.matcher(input);
        Matcher lowerMatcher = lowerCase.matcher(input);

        if(upperMatcher.find()){
            System.out.println("A");
        }else if(lowerMatcher.find()){
            System.out.println("a");
        }
        sc.close();
    }
}


Compiler output:
Main.java:5: error: cannot find symbol
        Pattern upperCase = Pattern.compile("[A-Z]");
        ^
  symbol:   class Pattern
  location: class ?lphabet
Main.java:5: error: cannot find symbol
        Pattern upperCase = Pattern.compile("[A-Z]");
                            ^
  symbol:   variable Pattern
  location: class ?lphabet
Main.java:6: error: cannot find symbol
        Pattern lowerCase = Pattern.compile("[a-z]");
        ^
  symbol:   class Pattern
  location: class ?lphabet
Main.java:6: error: cannot find symbol
        Pattern lowerCase = Pattern.compile("[a-z]");
                            ^
  symbol:   variable Pattern
  location: class ?lphabet
Main.java:8: error: cannot find symbol
        Scanner sc = new Scanner(System.in);
        ^
  symbol:   class Scanner
  location: class ?lphabet
Main.java:8: error: cannot find symbol
        Scanner sc = new Scanner(System.in);
                         ^
  symbol:   class Scanner
  location: class ?lphabet
Main.java:12: error: cannot find symbol
        Matcher upperMatcher = upperCase.matcher(input);
        ^
  symbol:   class Matcher
  location: class ?lphabet
Main.java:13: error: cannot find symbol
        Matcher lowerMatcher = lowerCase.matcher(input);
        ^
  symbol:   class Matcher
  location: class ?lphabet
8 errors
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
char a
  cin >> a;
  if(a>='a'&&a<='z'){
  cout << 'a' << ;
    else {
    cout << 'A'<<;
    }
      
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:3: error: expected initializer before 'cin'
    6 |   cin >> a;
      |   ^~~
a.cc:7:6: error: 'a' was not declared in this scope
    7 |   if(a>='a'&&a<='z'){
      |      ^
a.cc:8:18: error: expected primary-expression before ';' token
    8 |   cout << 'a' << ;
      |                  ^
a.cc:9:5: error: expected '}' before 'else'
    9 |     else {
      |     ^~~~
a.cc:7:21: note: to match this '{'
    7 |   if(a>='a'&&a<='z'){
      |                     ^
a.cc:10:18: error: expected primary-expression before ';' token
   10 |     cout << 'A'<<;
      |                  ^
a.cc: At global scope:
a.cc:14:1: error: expected declaration before '}' token
   14 | }
      | ^
Language: C

#include <stdio.h> 
  
void check(char ch) 
{ 
  
    if (ch >= 'A' && ch <= 'Z') 
        printf("A", 
               ch); 
  
    else  (ch >= 'a' && ch <= 'z') 
        printf("a", 
               ch); 
  
   
} 

Compiler output:
main.c: In function 'check':
main.c:10:35: error: expected ';' before 'printf'
   10 |     else  (ch >= 'a' && ch <= 'z')
      |                                   ^
      |                                   ;
   11 |         printf("a",
      |         ~~~~~~
Language: C

#include <stdio.h> 
  
void check(char ch) 
{ 
  
    if (ch >= 'A' && ch <= 'Z') 
        printf("\n%c is an UpperCase character", 
               ch); 
  
    else if (ch >= 'a' && ch <= 'z') 
        printf("\n%c is an LowerCase character", 
               ch); 
  
    else
        printf("\n%c is not an aplhabetic character", 
               ch); 
} 

Compiler output:
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/14/../../../x86_64-linux-gnu/Scrt1.o: in function `_start':
(.text+0x17): undefined reference to `main'
collect2: error: ld returned 1 exit status
Language: C++

#include<bits/stdc++.h> 
using namespace std; 
  
void check(char ch) 
{ 
  
    if (ch >= 'A' && ch <= 'Z') 
        cout<< ch << " is an UpperCase character\n"; 
  
    else if (ch >= 'a' && ch <= 'z') 
    cout<< ch << " is an LowerCase character\n"; 
              
  
    else
        cout<< ch << " is not an aplhabetic character\n"; 
              
} 

Compiler output:
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/14/../../../x86_64-linux-gnu/Scrt1.o: in function `_start':
(.text+0x17): undefined reference to `main'
collect2: error: ld returned 1 exit status
Language: C++

#include <bits/stdc++.h>
#define rep(i,n) for(int i; i<n; i++)
typedef long long ll;
using namespace std;

int main(){
	char a;
	cin >> a;
	if(a >= "A"){ cout << "A" << endl;
	}else{ cout << "a" << endl;
	}
	return 0;
}




Compiler output:
a.cc: In function 'int main()':
a.cc:9:14: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
    9 |         if(a >= "A"){ cout << "A" << endl;
      |            ~~^~~~~~
Language: Java

import java.util.Scanner;
 
public class Main {
 
	public static void main(String[] args) {
      
		Scanner scan = new Scanner(System.in);
		String a = scan.next();
       
 
		if(Character.isUpperCase(a))System.out.println("A");
        else System.out.println("B");
 
	}
}

Compiler output:
Main.java:11: error: no suitable method found for isUpperCase(String)
		if(Character.isUpperCase(a))System.out.println("A");
		            ^
    method Character.isUpperCase(char) is not applicable
      (argument mismatch; String cannot be converted to char)
    method Character.isUpperCase(int) is not applicable
      (argument mismatch; String cannot be converted to int)
1 error
Language: Java

import java.util.Scanner;
 
public class Main {
 
	public static void main(String[] args) {
      
		Scanner scan = new Scanner(System.in);
		String a = scan.next();
       
 
		if(Character.isUpperCase(a)System.out.println("A");
        else System.out.println("B");
 
	}
}

Compiler output:
Main.java:11: error: ')' expected
		if(Character.isUpperCase(a)System.out.println("A");
		                           ^
1 error
Language: Java

import java.util.Scanner;
 
public class Main {
 
	public static void main(String[] args) {
      
		Scanner scan = new Scanner(System.in);
		String a = scan.next();
       
 
		if(Character.isUpperCase(a.cartAt(0)))System.out.println("A");
        else System.out.println("B");
 
	}
}

Compiler output:
Main.java:11: error: cannot find symbol
		if(Character.isUpperCase(a.cartAt(0)))System.out.println("A");
		                          ^
  symbol:   method cartAt(int)
  location: variable a of type String
1 error
Language: Java

import java.util.Scanner;
 
public class Main {
 
	public static void main(String[] args) {
      
		Scanner scan = new Scanner(System.in);
		Char a = scan.next();
       
 
		if(a.isUpperCase(a))System.out.println("A");
        else System.out.println("B");
 
	}
}

Compiler output:
Main.java:8: error: cannot find symbol
		Char a = scan.next();
		^
  symbol:   class Char
  location: class Main
1 error
Language: Java

import java.util.Scanner;
 
public class Main {
 
	public static void main(String[] args) {
      
		Scanner scan = new Scanner(System.in);
		Char a = scan.next();
       
 
		if(c.isUpperCase(a))System.out.println("A");
        else System.out.println("B");
 
	}
}

Compiler output:
Main.java:8: error: cannot find symbol
		Char a = scan.next();
		^
  symbol:   class Char
  location: class Main
Main.java:11: error: cannot find symbol
		if(c.isUpperCase(a))System.out.println("A");
		   ^
  symbol:   variable c
  location: class Main
2 errors
Language: Java

import java.util.Scanner;
 
public class Main {
 
	public static void main(String[] args) {
      
		Scanner scan = new Scanner(System.in);
		Char a = scan.next();
       
 
		if(c.isUpperCase(a))System.out.println("A");
        else System.out.println("B");
 
	}

Compiler output:
Main.java:14: error: reached end of file while parsing
	}
	 ^
1 error
Language: Java

import java.util.Scanner;
import java.lang.Character;
 
public class Main {
 
	public static void main(String[] args) {
      
		Scanner scan = new Scanner(System.in);
		String a = scan.next();
        Character c = new Character();
 
		if(c.isUpperCase(a))System.out.println("A");
        else System.out.println("B");
 
	}
 
}

Compiler output:
Main.java:10: error: constructor Character in class Character cannot be applied to given types;
        Character c = new Character();
                      ^
  required: char
  found:    no arguments
  reason: actual and formal argument lists differ in length
Main.java:12: error: no suitable method found for isUpperCase(String)
		if(c.isUpperCase(a))System.out.println("A");
		    ^
    method Character.isUpperCase(char) is not applicable
      (argument mismatch; String cannot be converted to char)
    method Character.isUpperCase(int) is not applicable
      (argument mismatch; String cannot be converted to int)
2 errors
Language: Java

import java.util.Scanner;
 
public class Main {
 
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		String a = scan.next();
 
		if(Character.isUpperCase(a))System.out.println("A");
        else System.out.println("B");
 
	}
 
}

Compiler output:
Main.java:9: error: no suitable method found for isUpperCase(String)
		if(Character.isUpperCase(a))System.out.println("A");
		            ^
    method Character.isUpperCase(char) is not applicable
      (argument mismatch; String cannot be converted to char)
    method Character.isUpperCase(int) is not applicable
      (argument mismatch; String cannot be converted to int)
1 error
Language: C++

#include <cctype>
#include <iostream>
#include <cstring>
#include <cstdio>
 
using namespace std;
 
int main()
{
  char x;
  cin >> x;
    char str[] = x;
 
    for (int i=0; i<strlen(str); i++)
        putchar(tolower(str[i]));
    
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:18: error: initializer fails to determine size of 'str'
   12 |     char str[] = x;
      |                  ^
a.cc:12:18: error: array must be initialized with a brace-enclosed initializer
Language: C++

#include <cctype>
#include <iostream>
#include <cstring>
#include <cstdio>

using namespace std;

int main()
{
  cin >> x;
    char str[] = x;

    for (int i=0; i<strlen(str); i++)
        putchar(tolower(str[i]));
    
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:10: error: 'x' was not declared in this scope
   10 |   cin >> x;
      |          ^
a.cc:11:10: error: initializer fails to determine size of 'str'
   11 |     char str[] = x;
      |          ^~~
Language: C++

#include <cctype>
#include <iostream>
#include <cstring>
#include <cstdio>

using namespace std;

int main()
{
  
  cin >> x;
    char str[] = x;

    cout << "The lowercase version of \"" << str << "\" is " << endl;

    for (int i=0; i<strlen(str); i++)
        putchar(tolower(str[i]));
    
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:10: error: 'x' was not declared in this scope
   11 |   cin >> x;
      |          ^
a.cc:12:10: error: initializer fails to determine size of 'str'
   12 |     char str[] = x;
      |          ^~~
Language: C++

#include <cctype>
#include <iostream>
#include <cstring>
#include <cstdio>

using namespace std;

int main()
{
  
  cin << x;
    char str[] = x;

    cout << "The lowercase version of \"" << str << "\" is " << endl;

    for (int i=0; i<strlen(str); i++)
        putchar(tolower(str[i]));
    
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:10: error: 'x' was not declared in this scope
   11 |   cin << x;
      |          ^
a.cc:12:10: error: initializer fails to determine size of 'str'
   12 |     char str[] = x;
      |          ^~~
Language: C++

#include <algorithm>
#include <bitset>
#include <complex>
#include <deque>
#include <exception>
#include <fstream>
#include <functional>
#include <iomanip>
#include <ios>
#include <iosfwd>
#include <iostream>
#include <istream>
#include <iterator>
#include <limits>
#include <list>
#include <locale>
#include <map>
#include <memory>
#include <new>
#include <numeric>
#include <ostream>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <stdexcept>
#include <streambuf>
#include <string>
#include <typeinfo>
#include <utility>
#include <valarray>
#include <vector>
#include <array>
#include <atomic>
#include <chrono>
#include <condition_variable>
#include <forward_list>
#include <future>
#include <initializer_list>
#include <mutex>
#include <random>
#include <ratio>
#include <regex>
#include <scoped_allocator>
#include <system_error>
#include <thread>
#include <tuple>
#include <typeindex>
#include <type_traits>
#include <unordered_map>
#include <unordered_set>
using namespace std;


int main() {
	string s;
	cin >> s;
	if (isupper(s)) {
		cout << "A";

	}
	else {
		cout << "a";
	}
}




Compiler output:
a.cc: In function 'int main()':
a.cc:58:20: error: no matching function for call to 'isupper(std::string&)'
   58 |         if (isupper(s)) {
      |             ~~~~~~~^~~
In file included from /usr/include/c++/14/bits/basic_ios.h:37,
                 from /usr/include/c++/14/ios:46,
                 from /usr/include/c++/14/istream:40,
                 from /usr/include/c++/14/sstream:40,
                 from /usr/include/c++/14/complex:45,
                 from a.cc:3:
/usr/include/c++/14/bits/locale_facets.h:2631:5: note: candidate: 'template<class _CharT> bool std::isupper(_CharT, const locale&)'
 2631 |     isupper(_CharT __c, const locale& __loc)
      |     ^~~~~~~
/usr/include/c++/14/bits/locale_facets.h:2631:5: note:   candidate expects 2 arguments, 1 provided
In file included from /usr/include/c++/14/cctype:42,
                 from /usr/include/c++/14/bits/localefwd.h:42,
                 from /usr/include/c++/14/string:45,
                 from /usr/include/c++/14/bitset:52,
                 from a.cc:2:
/usr/include/ctype.h:117:1: note: candidate: 'int isupper(int)'
  117 | __exctype (isupper);
      | ^~~~~~~~~
/usr/include/ctype.h:117:1: note:   no known conversion for argument 1 from 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'int'
  117 | __exctype (isupper);
      | ^~~~~~~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;

int main()
{
   
  string s;cin>>s;
  string a;
  if((s-z)>0)
    s = a;
  else
    s = A
  
  
  cout<<s<<endl;
  
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:9: error: 'z' was not declared in this scope
    9 |   if((s-z)>0)
      |         ^
a.cc:12:9: error: 'A' was not declared in this scope
   12 |     s = A
      |         ^
Language: C

#include <bits/stdc++.h>

#define ll long long
#define pb push_back
#define an "\n"

using namespace std;


int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	string s;
	cin >> s;
	string a=s;
	transform(a.begin(), a.end(), a.begin(), ::toupper);
	if(s==a) {
		cout << "A";
	}
	else {
		cout << "a";
	}
}



Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C++

#include<bits/stdc++.h>
using namespace std;

int main()
{
  char alpha;
  cin >> alpha;
  if(isuppper(alpha))
    cout << "A\n";
  else
    cout << "a\n";
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:6: error: 'isuppper' was not declared in this scope; did you mean 'isupper'?
    8 |   if(isuppper(alpha))
      |      ^~~~~~~~
      |      isupper
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main()
{
 char c;
 cin>>c;
 if(isupper(c))
 cout<<'A';
 else
 cout<<'a';

Compiler output:
a.cc: In function 'int main()':
a.cc:10:12: error: expected '}' at end of input
   10 |  cout<<'a';
      |            ^
a.cc:4:1: note: to match this '{'
    4 | {
      | ^
Language: Java

import java.util.Scanner;

class Alphabets{
 
Scanner sc=new Scanner(System.in);
  
  String c=sc.next();
 
  
 // String s=c.toLowerCase();
  
  if(c.isLowerCase()){
  
  	c=c.toUpperCase();
  System.out.println(c);
  }
  else{ 
  c=c.toLowerCase();
    System.out.println(c);
  }
 

}

Compiler output:
Main.java:12: error: illegal start of type
  if(c.isLowerCase()){
  ^
Main.java:12: error: <identifier> expected
  if(c.isLowerCase()){
                  ^
Main.java:12: error: ';' expected
  if(c.isLowerCase()){
                    ^
Main.java:17: error: illegal start of type
  else{ 
  ^
4 errors
Language: Java

import java.util.Scanner;

class Alphabets{

Scanner sc=new Scanner(System.in);
  
  char c=sc.nextChar();
  
  if(c.isLower()){
  
  	c=c.toUpper();
  System.out.println(c);
  }
  else{ 
  c=c.toLower();
    System.out.println(c);
  }

\
}

Compiler output:
Main.java:9: error: illegal start of type
  if(c.isLower()){
  ^
Main.java:9: error: <identifier> expected
  if(c.isLower()){
              ^
Main.java:9: error: ';' expected
  if(c.isLower()){
                ^
Main.java:14: error: illegal start of type
  else{ 
  ^
Main.java:19: error: illegal character: '\'
\
^
Main.java:20: error: reached end of file while parsing
}
 ^
6 errors
Language: C++

#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); i++)
using ll = long long;
using namespace std;
using P = pair<int,int>;

const int MX = 100005;

int main(){
    int n,q;
    cin >> n >> q;
    vector<int> cnt(MX);
    rep(i,n){
        int a;
        cin >> a;
        cnt[a]++;
    }
    ll tot = 0;
    rep(i,MX) tot += i*cnt[i];

    int q;
    cin >> q;
    rep(i,q){
        int b,c;
        cin >> b >> c;
        tot -= b*cnt[b];
        tot -= c*cnt[c];
        cnt[c] += cnt[b];
        cnt[b] = 0;
        tot += b*cnt[b];
        tot += c*cnt[c];
        cout << tot << endl;
    }
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:21:9: error: redeclaration of 'int q'
   21 |     int q;
      |         ^
a.cc:10:11: note: 'int q' previously declared here
   10 |     int n,q;
      |           ^
Language: C++

#include<bits.stdc++.h>
using namespace std;
int main()
{
  char c;
  cin>>c;
  if(c>='a' && c<='z')
  {
    cout<<"a"<<endl;
  }
  else
  {
    cout<<"A"<<endl;
  }
}

Compiler output:
a.cc:1:9: fatal error: bits.stdc++.h: No such file or directory
    1 | #include<bits.stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: C++

include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); i++)
using ll = long long;
using namespace std;
using P = pair<int,int>;

int main(){
    char c;
    cin >> c;
    if(islower(c)) cout << 'a' << endl;
    else cout << 'A' << endl;
    return 0;
}

Compiler output:
a.cc:1:1: error: 'include' does not name a type
    1 | include <bits/stdc++.h>
      | ^~~~~~~
a.cc:5:11: error: 'pair' does not name a type
    5 | using P = pair<int,int>;
      |           ^~~~
a.cc: In function 'int main()':
a.cc:9:5: error: 'cin' was not declared in this scope
    9 |     cin >> c;
      |     ^~~
a.cc:1:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
  +++ |+#include <iostream>
    1 | include <bits/stdc++.h>
a.cc:10:8: error: 'islower' was not declared in this scope
   10 |     if(islower(c)) cout << 'a' << endl;
      |        ^~~~~~~
a.cc:10:20: error: 'cout' was not declared in this scope
   10 |     if(islower(c)) cout << 'a' << endl;
      |                    ^~~~
a.cc:10:20: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:10:35: error: 'endl' was not declared in this scope
   10 |     if(islower(c)) cout << 'a' << endl;
      |                                   ^~~~
a.cc:1:1: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
  +++ |+#include <ostream>
    1 | include <bits/stdc++.h>
a.cc:11:10: error: 'cout' was not declared in this scope
   11 |     else cout << 'A' << endl;
      |          ^~~~
a.cc:11:10: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:11:25: error: 'endl' was not declared in this scope
   11 |     else cout << 'A' << endl;
      |                         ^~~~
a.cc:11:25: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
Language: C++

#include<bits/stdc++.h>
using namespace std;
#define fastio ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
#define ll long long
const int N = 2e5 + 1;

void findAns()
{
  char c;
  cin>>c;

  if(islowercase(c)) cout<<"a\n";
  else
    cout<<"A";


}
int main()
{
// #ifndef ONLINE_JUDGE
//     freopen("in.txt", "r", stdin);
//     freopen("o1.txt", "w", stdout);
// #endif

    fastio;

    // ll int t;
    // cin >> t;

    // while (t--)
    findAns();
}

Compiler output:
a.cc: In function 'void findAns()':
a.cc:12:6: error: 'islowercase' was not declared in this scope; did you mean 'islower_l'?
   12 |   if(islowercase(c)) cout<<"a\n";
      |      ^~~~~~~~~~~
      |      islower_l
Language: Java

public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner scanner = new Scanner(System.in);
		String S = scanner.nextLine();
		char s = S.charAt(0);

		System.out.println(Character.isUpperCase(s)?"A":"a");

	}

Compiler output:
Main.java:11: error: reached end of file while parsing
	}
	 ^
1 error
Language: C++

#include<bits/stdc+.h>
using namespace std;
int main()
{
  char ch;
  cin>>ch;
  if(ch>=65 && ch<=90)cout<<"A"<<endl;
  else cout<<"a"<<endl;
}

Compiler output:
a.cc:1:9: fatal error: bits/stdc+.h: No such file or directory
    1 | #include<bits/stdc+.h>
      |         ^~~~~~~~~~~~~~
compilation terminated.
Language: Java

import java.io.*;
import java.util.*;
 
class Main
{
   public static void main(String[] args)
   {
       BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
       char c[]=(br.readLine()).toCharArray();
       if(c[1]>='A' && 'Z'<=c[1])
       { 
         System.out.println("A");
       }
        if(c[1]>='a' && 'z'<=c[1])
       { 
         System.out.println("a");
       }
     
     
   
   }
}


Compiler output:
Main.java:9: error: unreported exception IOException; must be caught or declared to be thrown
       char c[]=(br.readLine()).toCharArray();
                            ^
1 error
Language: C++

#include<bits/stdc+.h>
using namespace std;
int main()
{
  char ch;
  cin>>ch;
  if(ch>=65 && ch<=90)cout<<"A"<<endl;
  else cout<<"a"<<endl;
  

Compiler output:
a.cc:1:9: fatal error: bits/stdc+.h: No such file or directory
    1 | #include<bits/stdc+.h>
      |         ^~~~~~~~~~~~~~
compilation terminated.
Language: Java

import java.util.Scanner;

  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String a = sc.next();
    if (Character.isUpperCase(a.charAt(0)))
      System.out.println("A");
    else
      System.out.println("a");
  }


Compiler output:
Main.java:3: error: unnamed classes are a preview feature and are disabled by default.
  public static void main(String[] args) {
                ^
  (use --enable-preview to enable unnamed classes)
1 error
Language: Java

import java.io.*;
import java.util.*;
 
class Main
{
   public static void main(String[] args)
   {
       BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
       char c=br.read();
       if(c>='A' && 'Z'<=c)
       { 
         System.out.println("A");
       }
        if(c>='a' && 'z'<=c)
       { 
         System.out.println("a");
       }
     
     
   
   }
}

Compiler output:
Main.java:9: error: incompatible types: possible lossy conversion from int to char
       char c=br.read();
                     ^
1 error
Language: Java

public class Main{
	public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        String s = sc.next();
        if(Character.isLowerCase(s.charAt(0))){
            System.out.println("a");
        } else{
            System.out.println("A");
        }
    }
}


Compiler output:
Main.java:3: error: cannot find symbol
        Scanner sc = new Scanner(System.in);
        ^
  symbol:   class Scanner
  location: class Main
Main.java:3: error: cannot find symbol
        Scanner sc = new Scanner(System.in);
                         ^
  symbol:   class Scanner
  location: class Main
2 errors
Language: Java

public class Main {

	  public static void main(String[] args) {

	    Scanner sc = new Scanner(System.in);

	    String upperCases = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
	    String lowerCases = "abcdefghijklmnopqrstuvwxyz";

	    String oneChar = sc.next();
	    if (upperCases.indexOf(oneChar) >= 0) {
	       System.out.println("A");
	    } else {
	       System.out.println("a");
	    }
	  }
	}

Compiler output:
Main.java:5: error: cannot find symbol
	    Scanner sc = new Scanner(System.in);
	    ^
  symbol:   class Scanner
  location: class Main
Main.java:5: error: cannot find symbol
	    Scanner sc = new Scanner(System.in);
	                     ^
  symbol:   class Scanner
  location: class Main
2 errors
Language: Java

import java.io.*;
import java.util.*;

class Main
{
   public static void main(String[] args)
   {
       BufferedReader br=BufferedReader(new InputStreamReader(System.in));
       char c=br.readLine();
       if(c.isUpperCase())
       { 
         System.out.println("A");
       }
        if(c.isLowerCase())
       { 
         System.out.println("a");
       }
     
     
   
   }
}


Compiler output:
Main.java:8: error: cannot find symbol
       BufferedReader br=BufferedReader(new InputStreamReader(System.in));
                         ^
  symbol:   method BufferedReader(InputStreamReader)
  location: class Main
Main.java:9: error: incompatible types: String cannot be converted to char
       char c=br.readLine();
                         ^
Main.java:10: error: char cannot be dereferenced
       if(c.isUpperCase())
           ^
Main.java:14: error: char cannot be dereferenced
        if(c.isLowerCase())
            ^
4 errors