reverse_digit

#include <iostream>

int reverse_digit(int n) {
  int res = 0;
  while (n != 0) {
   res = res * 10 + (n % 10);
   n /= 10;
  }
  return res;
}

int main() {
  using namespace std;
  int n;
  cin >> n;
  cout << reverse_digit(n) << endl;
}