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

int main() {
    int red_num = 0;
    for (int i = 0; i < 3; ++i) {
        string s; cin >> s;
        if (s == "RED") ++red_num;
    }
    if (red_num > 1) cout << "RED" << endl;
    else cout << "BLUE" << endl;
}