#include <iostream> using namespace std; int main(){ int a,b,c,d,n; cin >> a,b,c,d; n = a,b,c,d; a = n / 1000; b = n / 100 % 10; c = n / 10 % 10; d = n / 1 % 10; cout << d << a << b << c <<endl; return 0; }