#include <iostream>
using namespace std;

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