#include<iostream>
#include<string>
using namespace std;

int count(string S) {
	return (S[0] == 'R'&&S[1] == 'E'&&S[2] == 'D') ? 1 : 0;
}


int main() {
	
	string s1,s2,s3;
	int c=0;
	cin >> s1 >> s2 >> s3;
	c += count(s1);
	c += count(s2);
	c += count(s3);

	cout << ((c > 1) ? "RED" : "BLUE") <<endl;

	return 0;
}