#include <iostream>
#include <string>

int main() {
	std::string a, b, c;

	std::cin >> a >> b >> c;

	int count = 0;
	if (a[0] == 'R') {
		count++;
	}
	if (b[0] == 'R') {
		count++;
	}
	if (c[0] == 'R') {
		count++;
	}

	if (count >= 2) {
		std::cout << "RED" << std::endl;
	} else {
		std::cout << "BLUE" << std::endl;
	}
	return 0;
}