Go: package main

import (
  "fmt"
)

func main() {
  var a string
  fmt.Scan(&a)
  for i:= len(a) -1; i>=0; i-- {
    fmt.Print(string(a[i]))
  }
  fmt.Println()
}

C++: #include <algorithm>
#include <vector>
#include <math.h>
#include <stdio.h>
#include <cctype>
#include <iostream>
#include <set>
#include <string>
#include <queue>
#include <map>
#include <utility>
using namespace std;
int size(string x){
	string::size_type size=x.size();
	return size;
}
#define fu(l,k) for(int i=l;i<k;i++)
#define fd(l,k) for(int i=l;i>k;i--)
#define sort(ss) sort(ss.begin(), ss.end())
#define rsort(ss) sort(ss.rbegin(), ss.rend())
typedef  vector<string> vs;
typedef  vector<int> vi;
double pi(){
	return acos(-1.0);
}
typedef set<int> set_i;
typedef set<string> set_s;
int INF=1000000;
int main(){
	string ss;
	cin>>ss;
	int sr=size(ss);
	for(int i=sr-1;i>=0;i--){
		if(i==0) cout<<ss[i]<<endl;
		else cout<<ss[i];
	}
}

C++: //============================================================================
// Name        : 0006.cpp
// Author      : 
// Version     :
// Copyright   : Your copyright notice
// Description : Hello World in C++, Ansi-style
//============================================================================

#include <iostream>
#include <algorithm>
using namespace std;

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

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

using namespace std;

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

C++: (function() {
	'use strict';
	var ArrayProto = Array.prototype, ObjProto = Object.prototype, FuncProto = Function.prototype;

	var push = ArrayProto.push,
	slice = ArrayProto.slice,
	concat = ArrayProto.concat,
	toString = ObjProto.toString,
	hasOwnProperty = ObjProto.hasOwnProperty;

	var
	nativeForEach = ArrayProto.forEach,
	nativeMap = ArrayProto.map,
	nativeReduce = ArrayProto.reduce,
	nativeReduceRight = ArrayProto.reduceRight,
	nativeFilter = ArrayProto.filter,
	nativeEvery = ArrayProto.every,
	nativeSome = ArrayProto.some,
	nativeIndexOf = ArrayProto.indexOf,
	nativeLastIndexOf = ArrayProto.lastIndexOf,
	nativeIsArray = Array.isArray,
	nativeKeys = Object.keys,
	nativeBind = FuncProto.bind;

	this._ = {};
	var each = _.each = _.forEach = function(obj, iterator, context) {
		if (obj == null) return;
		if (nativeForEach && obj.forEach === nativeForEach) {
			obj.forEach(iterator, context);
		} else if (obj.length === +obj.length) {
			for (var i = 0, l = obj.length; i < l; i++) {
				if (iterator.call(context, obj[i], i, obj) === breaker) return;
			}
		} else {
			for (var key in obj) {
				if (_.has(obj, key)) {
					if (iterator.call(context, obj[key], key, obj) === breaker) return;
				}
			}
		}
	};

	_.extend = function(obj) {
		each(slice.call(arguments, 1), function(source) {
			if (source) {
				for (var prop in source) {
					obj[prop] = source[prop];
				}
			}
		});
		return obj;
	};
}).call(global);

(function(undefined){
	'use strict';

	var INPUT_TYPE = 'string';

	var INPUT_REGEXP_LIST = {};
	INPUT_REGEXP_LIST['string'] = /\w*/g;
	INPUT_REGEXP_LIST['number'] = /[-]?\d+/g;
	var INPUT_REGEXP = INPUT_REGEXP_LIST[INPUT_TYPE];

	(function init() {
		this.output = function() {
			console.log.apply( console, arguments );
		};
		this.stdin = process.openStdin();
		stdin.setEncoding('utf8');
		this.input_list = [];
		stdin.on('data', function(chunk){
			var result = chunk.match(INPUT_REGEXP);
			input_list = input_list.concat(result);
		});
		stdin.on('end', function(){
			fire();
		});
		_.extend( this, {
			input_number: function() {
				return parseInt( input_list.splice(0,1)[0] );
			},
			input_text: function() {
				return input_list.splice(0,1)[0];
			},
			has_next: function() {
				return ! input_list.length;
			}
		} );
	}).call( this );

	(function solver(){
		this.fire = function() {
			setTimeout( solve, 0, this );
		};
		function solve() {
			output( input_text().split('').reverse().join('') );
			if ( ! has_next() )
				setTimeout( solve, 0, this );
		}
	}).call(this);

}).call(global);

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

int main() {
  stirng s;
  while(cin >> s) {
    reverse(s.begin(), s.end());
    cout << s << endl;
  }
  return 0;
}

C++: #include<stdio.h>
int main(void)
{
	int i;
	char n[20];
	scanf("%s",&n);
		for(i=9;i>=0;i--){
			printf("%c",n[i]);
		}
	return 0;
}

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

int main()
{
        char str1[22],str2[22];
        int l;

        scanf("%s",str1);

        l = strlen(str1);

        for(int i=0;i<l;i++){
                str2[i] = str1[l-i-1];
        }

        printf("%s",str2);

        return 0;
}

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

using namespace std;

int main() {

	int l;
	char t, str[64];

	cin >> str;
	l=strlen(str);

	for(int i=0; i<l/2; i++) {
		t=str[i];
		str[i]=str[l-i-1];
		str[l-i-1]=t;
	}

	cout << str;

}

C++: #include <bits/stdc++.h>
using namespace std;
#define REP(i,n) for(int i=0; i<(n); i++)
#define REP2(i,x,n) for(int i=x; i<(n); i++) 
#define ALL(n) begin(n),end(n)
struct cww{cww(){ios::sync_with_stdio(false);cin.tie(0);}}star;
int main()
{
    string S;
    cin >> S;
    reverse( ALL( S ) );
    cout << S << endl;
    return 0;
}

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

int main(){
	std::string str;

	std::cin >> str;

	std::reverse_copy(str.begin(), str.end(),
		std::ostream_iterator<char>(std::cout,""));
  return 0;
}

C++: #include <stdio.h>
#include <string.h>
int main ()
{
    char x [10000];
    gets (x);
    strrev (x);
    puts(x);
    return 0 ;
}

C++: #include <cstdio>
#include <cstdlib>
#include <cmath>
#include <climits>
#include <cfloat>
#include <map>
#include <utility>
#include <set>
#include <iostream>
#include <memory>
#include <string>
#include <vector>
#include <algorithm>
#include <functional>
#include <sstream>
#include <complex>
#include <stack>
#include <queue>
using namespace std;
static const double EPS = 1e-5;
typedef long long ll;
#define FOR(i,n) for(i=0;i<n;i++)
#define rep(i,n) for(int i=0;i<n;i++)

int main(){
	string s;
	cin>>s;
	rep(i,s.size()){
		putchar(s[s.size()-i-1]);
	}
puts("");
	return 0;
}

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

int main() {
	string str;

	cin >> str;

	reverse(str.begin(), str.end());

	cout << str << endl;
	
	return 0;
}

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

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];
	}
	cout<<endl;
	return 0;
}

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

using namespace std;

int main(void)
{
	int len;
	char str[20];
	cin >> str;
	
	string str1 = str;
	len = str1.size();
	
	for(int i = len-1; i >= 0; i--){
		cout << str[i];
	}
	cout << endl;
	return 0;
}