#include<bits/stdc++.h>
using namespace std;
int n,m,z,x,c;
int main(){
    cin>>n;
    for(int i=0;i<4;i++){
        cout<<n%10;
        n/=10;
    }
}
/**************************************************************
	Problem: 1029
	User: zhengzihao
	Language: C++
	Result: Wrong Answer
****************************************************************/