#include <iostream>
#include <string>
using namespace std;
int main(void){
    // Your code here!
    string S[3];
    cin>>S[0]>>S[1]>>S[2];
    int R=0;
    for (int i=0;i<3;i++){
        if (S[i]=="RED") R+=1;
    }
    if (R>=2){
        printf("RED");
        
    }
    else{
        printf("BLUE");
    }
    return 0;
}