#include <iostream>
using namespace std;

int main() {
  int n;
  cin>>n;
  int ge=n%10;
  int shi=n%100/10;
  int bai=n%1000/100;
  int qian=n/1000;
  cout<<ge<<shi<<bai<<qian;
}
// 64 位输出请用 printf("%lld")