#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);

	int r = 0;
	for(int i = 0; i < 3; i++) {
		string s;
		cin >> s;
		if(s == "RED") r++;
	}
	if(r >= 2) cout << "RED" << endl;
	else cout << "BLUE" << endl;
}