#include <iostream>
#include <string>
int main() {
	std::string S[3];
	for (int i = 0; i < 3; i++) {
		std::cin >> S[i];
	}
	int RED = 0;
	int BLUE = 0;
	for (int i = 0; i < 3; i++) {
		if (S[i] == "RED") {
			RED++;
		}
		else if (S[i] == "BLUE") {
			BLUE++;
		}
	}

	if (RED > BLUE) {
		std::cout << "RED" << std::endl;
	}

	if (BLUE > RED) {
		std::cout << "BLUE" << std::endl;
	}

	return 0;
}