#include <bits/stdc++.h>
using namespace std;
int main(){
		int q,w,e,r,a; 
	cin>>q;
	w=q%10;
	e=q/10%10;
	r=q/100%10;
	a=q/1000%10;
	cout<<a+w*1000+e*100+r*10;
	return 0;
	}

/**************************************************************
	Problem: 1029
	User: ljl2
	Language: C++
	Result: Accepted
	Time:12 ms
	Memory:2072 kb
****************************************************************/