#include <iostream>

using namespace std;

int main () {
	
	int n = 0, red = 0;
	string buf;
	for (int i = 0; i < 3; ++i) {
		cin >> buf;
		if (buf == "RED") {
			++red;
		}
		++n;
	}
	
	if (red > n - red) {
		cout << "RED" << endl;
	} else {
		cout << "BLUE" << endl;
	}
	
	return 0;
}