//Normal

#define _GLIBCXX_DEBUG
#define ll long long
#include <bits/stdc++.h>
using namespace std;
using Graph = vector<vector<int>>;

void print(auto a){
  cout << a;
}

void prints(auto a){
  cout << a << " ";
}

void prints(){
  cout << " ";
}

void printl(auto a){
  cout << a << endl;
}

void printl(){
  cout << endl;
}

void fix(int n){
  cout << fixed << setprecision(n);
}

int main(){
  int ans = 0;
  string S;
  
  while(cin >> S){
    S == "RED" ? ans++ : ans--;
  }
  
  ans > 0 ? printl("RED") : printl("BLUE");
  
  return 0;
}