#include<iostream>
#include<string>
#include<string.h>
#include<algorithm>
#include<stdio.h>
#include<cmath>
#include<vector>
#include<utility>
#include<queue>
#include<stack>
#include<stdlib.h>
#define FOR(i, a, b) for(int i=(a);i<=(b);i++)
#define RFOR(i, a, b) for(int i=(a);i>=(b);i--)
#define MOD 1000000007

using namespace std;


int main(void) {
	string s, t, u;
	int red = 0, blue = 0;

	cin >> s >> t >> u;
	if (s.find("RED") != -1) {
		red++;
	}
	else {
		blue++;
	}
	if (t.find("RED") != -1) {
		red++;
	}
	else {
		blue++;
	}
	if (u.find("RED") != -1) {
		red++;
	}
	else {
		blue++;
	}
	if (blue > red) {
		cout << "BLUE" << endl;
	}
	else {
		cout << "RED" << endl;
	}
	return 0;
}