#include<bits/stdc++.h>
using namespace std;
int main() {
	int n,b,q,g,s,h;
	float j;
	cin>>n;
	s=n/10%10;
	g=n%10;
	b=n/100%10;
	q=n/1000; 
	j=s*1000+g*100+q*10+b;
	cout<<j;
}

/**************************************************************
	Problem: 1616
	User: chenjunlin
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/