#include <bits/stdc++.h>
using namespace std;
int main(){
  string S1;
  cin >> S1;
  string S2;
  cin >> S2;
  string S3;
  cin >> S3;
  int RED = 0;
  int BLUE = 0;
  if (S1 == "RED"){
    RED++;
  }
  if (S1 == "BLUE"){
    BLUE++;
  }
  if (S2 == "RED"){
    RED++;
  }
  if (S2 == "BLUE"){
    BLUE++;
  }
  if (S3 == "RED"){
    RED++;
  }
  if (S3 == "BLUE"){
    BLUE++;
  }
  if (RED > BLUE){
    cout << "RED" << endl;
  }
  if (BLUE > RED){
    cout << "BLUE" << endl;
  }
}