#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
#define pb push_back
#define mp make_pair
#define rep(i,n) for(int i=0;i<(n);++i)

int main(){
	cin.tie(0);
	ios::sync_with_stdio(false);
	int cnt=0;
	rep(i,3){
		string s;cin >> s;
		if(s=="RED") cnt++;
	}
	if(cnt>=2) cout << "RED" << endl;
	else cout << "BLUE" << endl;
}