#include <iostream>
#include <cstring>
#define REP(i, n) for(int i=0; i< (int)(n); i++)

using namespace std;

int main(void){
    int count=0;
    char str[5];
    
    REP (i, 3){
        cin >> str;
        if(strcmp(str, "BLUE")==0)count++;
    }
    if(count >=2){
        cout << "BLUE";
    }else{
        cout << "RED";
    }
    return 0;
}