#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n,g,s,b,q;
    cin>>n;
    q = n / 1000;
    b = n / 100 % 10;
    s = n / 10 % 10;
    g = n % 10;
    cout<<b*1000+q*100+g*10+s;
}
/**************************************************************
	Problem: 1619
	User: zhangailin
	Language: C++
	Result: Accepted
	Time:11 ms
	Memory:2072 kb
****************************************************************/