#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,i=0,v=0,z=0,a=0,m=0;
	cin>>n;
		i=n%10;
		v=n%100/10;
		z=n%1000/100;
		a=n/1000;
		m=z*1000+a*100+i*10+v;
		cout<<m;
    }

/**************************************************************
	Problem: 1619
	User: huxuanchen
	Language: C++
	Result: Accepted
	Time:6 ms
	Memory:2072 kb
****************************************************************/