#include<iostream>
#include<string>

using namespace std;

int main()
{
    string s;
    int cnt_red=0, cnt_blue=0;
    for(int i=0; i<3; i++) {
        cin>>s;
        if(s[0]=='B') { cnt_blue++; }
        else if(s[0]=='R') { cnt_red++; }
        else { continue; }
    }
    if(cnt_red<cnt_blue) { cout << "BLUE" << endl; }
    else if(cnt_red>cnt_blue) { cout << "RED" << endl; }
    return 0;
}