#include<bits/stdc++.h> using namespace std; int main() { int a; cin >> a; int qian = a / 1000; int bai = (a / 100) % 10; int shi = (a / 10) % 10; int ge = a % 10; printf("%1d%1d%1d%1d\n", ge, qian, bai, shi); return 0; }