while

#include<bits/stdc++.h>//submitRecord//
using namespace std;
//const int N=1e7+10;
int main(){
//freopen("","r",stdin);
//freopen("","w",stdout);
ios::sync_with_stdio();
cin.tie(nullptr);
cout.tie(nullptr);
int n,sum=0;
cin>>n;
while(n!=0){
sum=sum*10+n%10;
n/=10;
}
cout<<sum;
//fclose(stdin);
//fclose(stdout);
return 0;
}