#include <bits/stdc++.h>

using namespace std;

typedef unsigned long long ull;
typedef long long ll;

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