#include<bits/stdc++.h>
using namespace std;
int main()
{
	int s, a;
	while(cin >> s)
	{
		a = s / 1000;//ge
		a += s / 100 % 10 * 10;//shi
		a += s / 10 % 10 * 100;//bai
		a += s % 10 * 1000;//qian
		cout << a << endl;
	}
	return 0;
}