#include<bits/stdc++.h>
#define rep(i,n)for(int i=0;i<(n);i++)
using namespace std;

int main() {
	string a, b, c; cin >> a >> b >> c;
	map<string, int>mp;
	mp[a]++; mp[b]++; mp[c]++;
	puts(mp["RED"] > mp["BLUE"] ? "RED" : "BLUE");
}