#include<iostream>
using namespace std;
int x,a,b,c,d;
int main(){
	cin>>x;
	a=x/1000; x%=1000;
	b=x/100; x%=100;
	c=x/10; x%=10;
	d=x;
	cout<<1000*d+100*c+10*b+a;
	return 0;
}

/**************************************************************
	Problem: 1029
	User: zhangziang
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/