Go: package main

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

func reverse(s string) string {
	runes := []rune(s)
	for i, j := 0, len(runes)-1; i < j; i, j = i+1, j-1 {
		runes[i], runes[j] = runes[j], runes[i]
	}
	return string(runes)
}

func main() {
	scanner := bufio.NewScanner(os.Stdin)
	scanner.Scan()
	input := scanner.Text()
	fmt.Println(reverse(input))
}

C++: #include <cstdio>
#include <iostream>
#include <cmath>
#include <ctype.h>
#include <string> 
#include <sstream>
#include <iostream>
#include <algorithm>
#include <cstdlib>
#include <map>
#include <queue>
#include <utility>
#include <vector>
#include <set>
#include <list>
#include <cstring>
#include <stack>
   
using namespace std;

int main()
{
    string s;
    cin >> s;
    for(int i = s.length() - 1; i >= 0; i--){
        cout << s[i];
    }
    cout << endl;
    return 0;
}

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

int main(){

  string str;

  cin >> str;

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

  cout << endl;

}

C++: #include <iostream>
#include <string>
using namespace std;
int main(){
char a[40];
int len,b;
cin.getline(a,40);
len = strlen(a);
for(int i=len;i>=0;i--){
cout<<a[i];
}
return 0;
}

C++: #include<iostream>

using namespace std;

int main()
{
    string str;
    cin >> str;
    string rev(str.rbegin(), str.rend());
    cout << rev;
}

C++: #include<iostream>
using namespace std;
int main(){
  int i; int l  = 0;
	   char str[21]; char str1[21];
  cin >> str;
  for(i=0;str[i] != '\0';){i++;}
    for(int k = i-1;k >=0 ;l++, k--){
    str1[l] = str[k];    
  }
  cout << str1 << endl;
}

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

int main(){
  string str;
  cin >> str;
  int l = strlen(str);
  for(int i = l - 1; i >= 0; i--){
    cout << str[i];
  }
  cout << endl;
}

C++: #include<stdio.h>
#include<string.h>
int main(void)
{
    char a[21];
	int i,n;
	scanf("%s",&a);
	n=strlen(a);
	for(i=n-1;i>=0;i--){
	    printf("%c",a[i]);
	}
	printf("\n");
	return 0;
}

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



int main(void){
	
	string str;
	getline(cin, str);


	for (int i = 0; i < (str.length()/2); i++){
	
		swap(str[i], str[str.length() - i-1]);
	}


	for (int i = 0; i<str.length(); i++){

		cout << str[i];
	}cout << endl;

	
	return 0;
}

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

#include <stdio.h>
#include <stdlib.h>
#include <string.h>


int main()
{
	char str[21] = "\0";
	int X;

	scanf("%s", str);

	for (X = strlen(str)-1; X > 0; X--)
	{
		if (X <= (strlen(str) - 1) - X)
			break; 

		str[(strlen(str)-1) - X] ^= str[X];
		str[X] ^= str[(strlen(str)-1) - X];
		str[(strlen(str)-1) - X] ^= str[X];
	}
	printf("%s\n", str);

	return 0;
}
int main()
{
	char str[21] = "\0";
	int X;

	scanf("%s", str);

	for (X = strlen(str)-1; X > 0; X--)
	{
		if (X <= (strlen(str) - 1) - X)
			break; 

		str[(strlen(str)-1) - X] ^= str[X];
		str[X] ^= str[(strlen(str)-1) - X];
		str[(strlen(str)-1) - X] ^= str[X];
	}
	printf("%s\n", str);

	return 0;
}

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

int main(void){

	string text;
	cin>>text;
	reverse(text.begin(), text.end());
	cout<<text<<endl;
	return 0;
}

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

C++: #include<stdio.h>
#include<string.h>
int main(){
  int i,j,a,b;
  char str[2１];
  scanf("%s",str);
  a=strlen(str);
  for(i=a;i>=0;i--){
    printf("%c",str[i]);
  }
  printf("\n");
  return 0;
}

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

using namespace std;

int main(){
	string s;

	cin >> s;
	reverse(s.begin(), s.end());
	cout << s << endl;

	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 <iostream>
#include <string>
#include <cstdio>
#include <cstdlib>
#include <algorithm>
using namespace std;

int main() {
    ios::sync_with_stdio(false);
    string s;
    cin >> s;
    reverse(s.begin(), s.end());
    cout << s << endl;
    return 0;
}

C++: #include <iostream>
#include <string>

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

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

int main(){
  string str;
  cin >> str;
  reverse(str.begin(),str.end());
  cout << str << endl;
  return 0;
}

C++: #include <iostream>
#include <string>
#include <queue>

int main(){
    std::string str;
    std::queue<char> que;
    std::cin >> str;
    const int size = str.size();
    for(int i = 0; i < size; ++i){
        que.push(str.back());
        str.erase(str.size() - 1, 1);
    }
    for(int i = 0; i < size; ++i){
        if(i != size - 1){
            std::cout << que.front();
            que.pop();
        }else{
            std::cout << que.front() << std::endl;
        }
    }
    return 0;
}

C++: #include<iostream>
#include<cstring>
#include<string>

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

	for(int i = str.length()-1; i >= 0 ; --i)
		std::cout << str.at(i);

	std::cout << std::endl;


  return 0;
}

C++: #include <iostream>
#include <cstring>
#include <cstdio>

using namespace std;

void sort(char *str){
	int len, len2 = 0;
	char work; 
	len = strlen(str);

	for(len = len - 1; len > len2; len--, len2++){
		work = str[len];
		str[len] = str[len2];
		str[len2] = work;
	}
}

int main(){
	char str[20];
	cin >> str;
	sort(str);
	cout << str << endl;

	return 0;
}

C++: #pragma GCC optimize("Ofast,unroll-loops")
#include<bits/stdc++.h>

using namespace std;
using Int = long long;
typedef pair<int,int> Pi; typedef pair<Int,Int> Pl;
constexpr int mod = 1e9+7;
constexpr int INF32 = numeric_limits<int>::max();
constexpr Int INF64 = numeric_limits<Int>::max();
#define END {cout<<ans<<'\n'; return 0;}
#define ALL(v) (v).begin(),(v).end()
#define fi first
#define se second
#define mp make_pair
#define eb emplace_back
#define Pr(t) priority_queue<t>
#define gPr(t) priority_queue<t,vector<t>,greater<t>>
#define V(t) vector<t>
#define rer(i,l,r) for(int(i)=(l); (i)<(r); ++(i))
#define rep(i,n) rer(i,0,n)
#define gnr(i,l,r) for(int (i)=(r)-1; (i)>=(l); --(i))
#define pri(a) cout<<(a)<<'\n'
#define pri2(a,n) {rep(i,n-1)cout<<a[i]<<' '; if(n)cout<<a[n-1]<<'\n';}
#define prip(p) cout<<(p).fi<<' '<<(p).se<<'\n'
template<class T> inline bool cmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool cmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }

int n,m,_,x,y,q;
string s,sb;
bool ok;
char cf,cb;

int main(){
  cin.tie(nullptr); ios::sync_with_stdio(0);
  //cout<<fixed<<setprecision(20);
  
  cin>>s; reverse(ALL(s)); pri(s);
}

C++: #include<stdio.h>
#include<string.h>
int main(){
  int n,i;
  char s1[21];
  scanf("%s",s1);
  int len=strlen(s1);
  for(i=len;i>=0;i--){
    printf("%c",s1[i]);
  }
  printf("\n");
}

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

	return 0;
}

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

int main(){
	string a;
	while(cin>>a){
		string buf = "";
		for(int i=a.size()-1; i>=0; i--){
			buf += a[i];
		}
		cout<<buf<<endl;
	}
	return 0;
}

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

#define MAX 256

int main(void){

	char k[21];
	int c = 0;

	scanf("%s", &k);

	for (int i = 0; k[i] != '\0'; i++){
		c++;
	}

	for (int i = c; i >= 0; i--){
		printf("%c", k[i]);
	}
	printf("\n");
	
	return 0;
}