#include "bits/stdc++.h"
using namespace std;
#define REP(a,b) for(long long a = 0;a < b;++a)
int main(){
	int a = 0;
	REP(i,3){
	  string s;
	  cin >> s;
	  if(s == "RED")a++;
	}
	if(a >= 2){
	   cout << "RED" << endl;
	}else{
		cout << "BLUE" << endl;
	}
}