#include <bits/stdc++.h>

using namespace std;

int main(int argc, char **argv) {
	char a[3][5];
	scanf("%s%s%s", a[0], a[1], a[2]);

	int red = 0;
	for (int i = 0; i < 3; i++) {
		if (a[i][0] == 'R') {
			red++;
		}
	}
	printf("%s\n", red >= 2 ? "RED" : "BLUE");
	return 0;
}