#include <bits/stdc++.h>

using namespace std;

int main(void) {
    int r = 0;
    string ball;

    for (int i = 0; i < 3; i++) {
        cin >> ball;
        if (ball[0] == 'R') r++;
    }

    if (r <= 1) cout << "BLUE" << endl;
    else cout << "RED" << endl;

    return 0;
}