#include<iostream>
#include<algorithm>
#include <vector>
#include<cmath>
using namespace std;
typedef long long int lont;
int main() {
	vector<string>vec(3);
	for (int ia = 0; ia < 3; ia++) {
		cin >> vec.at(ia);
	}
	sort(vec.begin(), vec.end());
	if (vec.at(1) == "RED")cout << "RED"<<endl;
	else cout << "BLUE" << endl;
}