#include <iostream>
#include <algorithm>
#include <functional>
#include <string>
#include <climits>
#include <vector>
#include <numeric>
#include <complex>
using namespace std;

//#define __int64 long long
#define long __int64
#define REP(i,a,b) for(int i=a;i<b;i++)
#define rep(i,n) REP(i,0,n)
const int Vecy[4] = {0,-1,0,1};
const int Vecx[4] = {1,0,-1,0};

int main(){
	int cnt = 0;
	
	rep(i,3){
		string sin;
		cin >> sin;
		if(sin == "RED"){
			cnt ++;
		}
	}
	
	if(cnt >= 2){
		cout << "RED" << endl;
	}else{
		cout << "BLUE" << endl;
	}
    
    return 0;
}