#include <bits/stdc++.h>
using namespace std;
int main(void) {
  int a;
  char s[5];
  cin >> a >> s;
  if (a >= 3200)
    cout << s[0] << s[1] << s[2] << s[3] << endl;
  else
    cout << "red" << endl;
  ;
  return 0;
}
