#include<iostream>
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;
}
/**************************************************************
	Problem: 1029
	User: wuhanyu
	Language: C++
	Result: Accepted
	Time:11 ms
	Memory:2072 kb
****************************************************************/