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

int main() {
	vector<string> v(3);
	map<string, int> m;
	for (int i = 0; i < 3; i++) {
	    cin >> v[i];
		m[v[i]]++;
	}
	if (m["RED"]<m["BLUE"]) cout << "BLUE" << endl;
	else cout << "RED" << endl;
}