#include <iostream>
#include <vector>
#include <algorithm>
#include <string>

#define REP(i, a, b) for (int i = int(a); i < int(b); i++)

using namespace std;

typedef long long int lli;

int main() {
    int r = 0;
    REP (i, 0, 3) {
        string s;
        cin >> s;
        if (s == "RED") r++;
    }
    cout << (r >= 2 ? "RED" : "BLUE") << endl;
    return 0;
}