#include "bits/stdc++.h"
#define MOD 1000000007
#define INF 11234567890
#define in std::cin
#define out std::cout
#define rep(i,N) for(LL i=0;i<N;++i)
typedef long long int LL;

std::string S[3];

int main()
{
	in >> S[0] >> S[1] >> S[2];
	std::sort(S, S + 3);
	if (S[0] == "BLUE"&&S[1] == "BLUE")
	{
		out << "BLUE" << std::endl;
	}
	else
	{
		out << "RED" << std::endl;
	}
	return 0;
}