#include <bits/stdc++.h>

using namespace std;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int red = 0, blue = 0;
  for (int i = 0; i < 3; i++) {
    string s;
    cin >> s;
    if (s == "RED") red++;
    if (s == "BLUE") blue++;
  }
  if (red > blue) cout << "RED" << '\n';
  if (blue > red) cout << "BLUE" << '\n';
  return 0;
}