Go: package main

import (
	"fmt"
)

func main() {
	var str string
	rts := []string{}

	fmt.Scan(&str)
	for _, r := range str {
		rts = append([]string{string(r)}, rts...)
	}

	for _, v := range rts {
		fmt.Print(v)
	}
	fmt.Println()
}

C++: #include "bits/stdc++.h"
using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef vector<int> veci;
typedef vector<ll> vecll;
typedef vector<string> vecs;
template<class T,class U> using Hash=unordered_map<T,U>;

#define REP(i, a, n) for(ll i = a; i < (ll)n; i++)
#define RREP(i, a, n) for(ll i = n-1; i >= (ll)a; i--)
#define rep(i, n) REP(i, 0, n)
#define rrep(i, n) RREP(i, 0, n)
#define MD 1000000007

template<class T> T read(){T a;cin >> a;return a;}
template<class T> void read(T& a){cin >> a;}
template<class T, class ...Args> void read(T& a, Args&... args){cin >> a; read(args...);} 
template<class T> void rarr(T a, int n){for(int i = 0; i < n; i++) {cin >> a[i];}}
template<char c = ' ',class T> void write(T a){cout << fixed << setprecision(4) << a << endl;}
template<char c = ' ',class T,class ...Args> void write(T a, Args... args){cout << fixed << setprecision(4) << a << c; write<c>(args...);}
template<class T> void warr(vector<T> a, const char* c = " "){cout << a[0];for(int i = 1; i < (int)a.size(); i++)cout << c << a[i];cout << endl;;}
template<class T> void warr(T a, int n, const char* c = " "){cout << a[0];for(int i = 1; i < n; i++)cout << c << a[i];cout << endl;}
void split(string s, string delim, veci& result){result.clear();string::size_type pos = 0;while(pos != string::npos){string::size_type p = s.find(delim, pos);if(p == string::npos){result.push_back(atoi(s.substr(pos).data()));break;}else {result.push_back(atoi(s.substr(pos, p - pos).data()));}pos = p + delim.size();}}
void split(string s, string delim, vecs& result){result.clear();string::size_type pos = 0;while(pos != string::npos){string::size_type p = s.find(delim, pos);if(p == string::npos){result.push_back(s.substr(pos));break;}else {result.push_back(s.substr(pos, p - pos));}pos = p + delim.size();}}
ull gcd(ull a, ull b){while(true){ull k = a % b;if(k == 0)return b;a = b;b = k;}}
ull comb(ull n, ull m){ull p=1;m=min(m,n-m);for(ull i=1;i<=m;i++){p*=n-i+1;p/=i;}return p;}

int main(void)
{
    string s;
    read(s);
    reverse(s.begin(),s.end());
    write(s);
    return 0;
}

C++: #include<stdio.h>
#include<string.h>
int main ()  
{  
	char str[21],ste[21];
	scanf("%s",str);
	int i,j=strlen(str)-1;
	for(i=0;i<strlen(str);i++)
	{
		ste[j]=str[i];
		j--;
	}
	puts(ste);
    return 0;
}

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

int main()
{
	char get[20] ;
	cin >> get ;

	int i = 0 ;
	char output[20] ;
	while( (strlen(get)-i) > 0 )
	{
		output[i] = get[strlen(get)-i-1] ;
		i ++ ;
	}

	output[strlen(get)] = '\0' ;
	cout << output << endl ;

	return 0 ;
}

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

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>
using namespace std;

int main(void)
{
  int i;
  char str[21];
  cin >> str;
  
  for(i = 0; str[i] != '\0'; i++){
  }

  int j;
  char ans[21];

  for(j = 0; j < i; j++){
    ans[j] = str[i-j-1];
  }
  ans[j] = '\0';

  cout << ans << endl;

  return 0;
}

C++: #include <iostream>

using namespace std;

int main()
{
	string str;

	cin >> str;

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

	cout << endl;

	return (0);
}

C++: #include<cstdio>
#include<ctype.h>
#include<iostream>
#include <algorithm>
using namespace std;

int main(){
    int cut=1;
    char str[25]={0};
    for(int i=0;i<25;i++){
        scanf("%c",&str[i]);
        if(str[i]=='\n')break;
        if(str[i]==' '){
            str[i]='\0';
            i-=1;
            }
        cut++;
    }
    for(int j=cut;j>-1;--j){
        printf("%c",str[j]);
    }
        cout <<""<<endl;
    return 0;
}

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

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

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

using namespace std;

int main(){
	char str[25];
	int i, num;
	
	cin >> str;

	num = strlen(str);

	for(i = num-1; i >= 0; i--){
		cout << str[i];
	}
	cout << endl;
}

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

using namespace std;

int main(){
	int a=0;
	int i=0;
	char moji[25];
	while(cin.get(moji[i])){
		a=moji[i];
		if(a==10){break;}
		i++;}
	for(int j=0;j<i;j++){cout.put(moji[i-1-j]);}}