666

#include<iostream>
using namespace std;
int main()
{
int n; cin>>n;
if(n<0) {cout<<"-";n=-n;}
if(n%10==0) {n=n/10;}
int sum=0;
while(n!=0)
{
int k=n%10;
sum=sum*10+k;
n=n/10;
}
cout<<sum<<endl;
return 0;
}