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

int main() {
    int count = 0;

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