C++ :

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

int a,ans;

int main()
{
//	freopen("aj.in","r",stdin);
//	freopen("aj.out","w",stdout);
	cin >>a;
	ans=0;
	for(; a>0; a/=10 )
	   ans= ans*10+a%10;
	cout <<ans<<endl;
	return 0;
}