#include <iostream>
using namespace std;
int main(void) {
	int red = 3;
	string s;
	for (int i = 0; i < 3; ++i) {
		cin >> s;
		if (s[0] == 'B') --red;
	}
	cout << (red > 1 ? "RED" : "BLUE") << endl;
	return 0;
}