#include<bits/stdc++.h>
using namespace std;
int main() {
	int s,a,b,_a,_b,_c,_d,_s;
	scanf("%d",&s);
	a=s/100;
	b=s%100;
	_a=a/10;
	_b=a%10;
	_c=b/10;
	_d=b%10;
	_s=_b*1000+_a*100+_d*10+_c;
	printf("%d",_s);
    return 0;
}

/**************************************************************
	Problem: 1619
	User: huangcanwu
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2076 kb
****************************************************************/