Go: package main

import (
	"bufio"
	"fmt"
	"os"
)

var scanner = bufio.NewScanner(os.Stdin)

func nextString() string {
	scanner.Scan()
	return scanner.Text()
}

func main() {
	scanner.Split(bufio.ScanWords)

	str := nextString()
	for i := len(str) - 1; i >= 0; i-- {
		fmt.Print(str[i:(i + 1)])
	}
	fmt.Print("\n")
}

C++: #include<stdio.h>
#include<iostream>

using namespace std;



int main(){
	char a[21];
	char b[21];
	cin>>a;
	int pos=0;
	for(int i=0;i<21;i++){
		if(a[i]=='\0')
			break;
		pos++;
	}
	int pos2=pos;
	b[pos]='\0';
	pos--;
	for(int n=0;n<pos2;n++){
		b[n]=a[pos];
		//cout << a[pos];
		pos--;
	}
	cout<<b<<"\n";
	return 0;
}

C++: #include <iostream>
using namespace std;

int main()
{
	int i;
	string str;
	
	cin >> str;
	
	for(i=str.size()-1; i>=0; i--){
		cout << str[i];
	}
	
	cout << "\n";
	
	return 0;
}

C++: #include<iostream>
#include<cstdio>
#include<algorithm>
#include<cstring>
using namespace std;
int main(){
	string s;
	cin>>s;
	for(int i=s.size()-1;i>=0;i--){
		cout<<s[i];
	}
	cout<<endl;
    return 0;
}

C++: #include<iostream>
#include<string>
using namespace std;
int main(){
	string a;
	cin >> a;
	for(int i=a.length()-1; i>-1; i--){
		cout << a[i];
	}
	return 0;
}

C++: #include<stdio.h>
#include<string.h>
int main()
{
    int l,i,j,b,k;
    char n[1000];
    while(gets(n))
    {
        l=strlen(n);
        b=-1;
        for(i=0;i<l;i++)
        {
            if(n[i]==' ')
            {
                for(j=i-1;j>b;j--)
                printf("%c",n[j]);
                printf(" ");
                b=i;
            }
        }
        for(i=l-1;i>b;i--)
            printf("%c",n[i]);
        printf("\n");
    }
    return 0;
}

C++: #include <stdio.h>

int main(){

	char str[20] = {},i;
	
	scanf("%s", str);
	
	for (i = 0; i < 20; i++){
		if (str[19 - i] >0){ printf("%c", str[19-i]); }
	}

	printf("\n");

	return 0;
}

C++: #include <cstdlib>
#include <cstdio>
#include <iostream>
#include <string>
#include <algorithm>

using namespace std;
int a;
char test[20];
char temp;

int main()
{
	scanf("%s",test);
	for(a=strlen(test)-1;a>=0;a--)
	{
	printf("%c",test[a]);
	}
	return 0; 
}

C++: #include<stdio.h>
#include<string.h>
int main(){
    char str[20];
    int i,j;
    gets(str);
    j = strlen(str);
    for(i=j-1;i>=0;i--){
        printf("%c",str[i]);
    }
    return 0;
}

C++: #include <iostream>
#include <string>
using namespace std;
int main() {
	string s;
	int i;
	cin >> s;
	for (i = 0; s[i + 1] != 0; i++);
	for (; i >= 0; i--)
		cout << s[i];
	cout << endl;
	return 0;
}

C++: #include <iostream>
#include <algorithm>
#include <string>
using namespace std;
int main(){
	string a;
	cin >> a;
	reverse (a.begin(),a.end());
	cout << a << endl;
}

C++: #include <iostream>
#include <algorithm>
#include <string>
using namespace std;
int main() {
   string str;
   cin >> str;
   reverse(str.begin(), str.end());
   cout << str << endl;
   return 0;
}

C++: #include <iostream>
#include<algorithm>
#include<cmath>
#include <string>
#include <vector>
typedef unsigned long long ULL;

 int main (){
	 std::string str;

	 std::cin >> str;

	 for (int i = 0; i < str.size(); ++i) {
		 std::cout << str[str.size() - 1 - i];
	 }

	 return 0;
}

C++: #include <iostream>
#include <string>
using namespace std;
 
int main()
{
    string str;
    cin >> str;
        for(int i=str.length()-1;i>=0;i--)
            cout << str[i];
    cout<< "\n";
}

C++: #include<stdio.h>
#include<math.h>
#include<string.h>
int main()
{   
    char a[20];
    char b[20];
    scanf("%s", a);
    int i = 0;
    int j = 0;
    while (strcmp(&a[i], "\0") != 0) {
        i += 1;
    }
    i -= 1;
    strcpy(&b[i], &a[i]);
    for (; i >=  0; i--) {
        b[j] = a[i];
        j += 1;
    } 
    printf("%s", b);
    return 0;
}

C++: #include <iostream>
#include <string>
using namespace std;
string s;
int main(){
    cin >> s;
    for(string::reverse_iterator it = s.rbegin(); it != s.rend(); it++) cout<<*it;
    return 0;
}

C++: #include<iostream>
using namespace std;

int main()
{
	char *a;
	char str[256];
	// cout << "data_size=" << data_size << endl;
	while (cin.getline(str,256)){
		int data_size = sizeof(a) / sizeof(a[0]);
		for(int i=0;i<=data_size;i++)
			cout << str[data_size - i];
		cout << endl;
	}
	return 0;
}

C++: #include <stdio.h>
#include <iostream>
#include <string>


using namespace std;

int main() {
int kazu;
char rin[21];
scanf("%s",rin);
	
	kazu = strlen(rin);
	
	for(int i = kazu-1; i >= 0; i--) {
	 cout << rin[i];
	}
	
	cout << "\n";
	
    return 0;
}

C++: #include <iostream>
#include <vector>
#include <math.h>
#include <string>

int main(void);
std::string rev_string(std::string str);

int main(){
	std::string str = "";
	std::cin >> str;
	std::cout << rev_string(str);

	//while (1);
	return 0;
}

std::string rev_string(std::string str){
	int i;
	int len = str.length();
	for (i = 0; i < len / 2; i++) {
		char temp = str[i];
		str[i] = str[len - i - 1];
		str[len - i - 1] = temp;
	}

	return str;
}

C++: #include <iostream>
#include <string>
using namespace std;
int main(void){
    int len;
    string a;
    std::cin >> a;
    len =a.length();
    if(len <= 20){
        for(int i = len - 1; i >=0; i--){
            if( isupper( a.at(i) )  == 0)
                std::cout << a.at(i);
        }
    }
    return 0;
}

C++: #include <cstdio>
#include <iostream>
#include <algorithm>
using namespace std;
 
int main() {
    char a[25], i;
    scanf("%s", &a);
    for(i=strlen(a)-1;i>=0;i--){
       printf("%c", a[i]);                         
                             
    }
    printf("\n");
    
    return 0;
}

C++: #include <iostream>

using namespace std;

int main(){
        char s[21];
        cin >> s;
        int n = 0;
        while(*(s+n)){
                n++;
        }   
        for(;n > 0;n--){
                cout << *(s+n-1);
        }   
        cout << endl;
}

C++: #include<iostream>
#include<string>
#include<algorithm>
#include <stdio.h>
using namespace std;


 int main(){
    string a;
    cin >> a;
    int len=a.length();
    for(int i=len;i>=0 ; i--)
    cout << a[i];
    cout<<endl;
 }

C++: #include <iostream>
#include <cstdio>
#include <string.h>

using namespace std;
static const int MAXV = 21;

int main() {
  char A[MAXV]={};
  cin >> A;
  int i=0;
  for(;i<MAXV;i++) {
    //printf("%c", A[i]);
    if (A[i] == 0) break;
  }
  i--;
  for(;i!=0;i--) {
    printf("%c", A[i]);
  }
  printf("\n");
}

C++: #include <iostream>
#include <cstring>
using namespace std;
int main(){
	char str[21];//="Hello world!";
	cin>>str;
	for(int i=strlen(str)-1;i>=0;--i){
		cout<<str[i];
	}
	return 0;
}

C++: #include <cstdio>
#include <cstring>
 
int main(){
 char str[21];
 scanf("%s",str);
 for(int i = strlen(str) - 1;i >= 0;i--){printf("%c",str[i]);}
 printf("\n");
 return 0;
}

C++: #include<iostream>
#include<string>
using namespace std;

int main()
{
	string str;
	cin >> str;

	for(int i=str.size()-1;i>=0;--i){
		cout << str[i];
	}

	return 0;
}

C++: #include <stdio.h>
#include <string.h>
 
int main(void)
{
  char str[25] = {0};
  int cx;

  fgets(str, sizeof(str), stdin);
  cx = strlen(str);

  for (int x=cx-2; x>=0; x--) {
    putchar(str[x]);
  }
  putchar(str[cx -1]);
 
  return 0;
}

C++: #include <iostream>

using namespace std;

int main() {
    int i,len;
    string ch;

    cin >> ch;

    len = ch.length();

    for(i = 0;i < len / 2;i++){
        char box = ch[i];
        ch[i] = ch[len - i];
        ch[len - i] = box;
    }

    for(i = 0; i <= len;i++){
        cout << ch[i];
    }
    cout << endl;

    return 0;
}