include <bits/stdc++.h>

using namespace std; int main() {

int a,b,c,d,e;
cin>>a;
b=a/1000;
c=a/100%10;
d=a/10%10;
e=a%10;
cout<<e * 1000 + d * 100 + c * 10 + b * 1<<endl;

}