#include<iostream>
#include<string>

using namespace std;

int main(){

	int Rc=0,Bc=0;
	string s1,s2,s3;

	cin>>s1>>s2>>s3;

	if(s1=="RED") Rc++;
	else Bc++;
	if(s2=="RED") Rc++;
	else Bc++;
	if(s3=="RED") Rc++;
	else Bc++;

	if(Rc>Bc) cout<<"RED"<<endl;
	else cout<<"BLUE"<<endl;
}