#define _CRT_SECURE_NO_WARNINGS

#include <algorithm>
#include <iostream>
#include <set>
#include <string>
#include <vector>




using namespace std;

typedef long long int ll;

#define REP(i,n) for(int i=0; i<(n); ++i )
#define REPR(i,n) for(int i=(n); i>=0; --i)
#define FOR(i,a,n) for(int i=(a); i<(n); ++i )
#define FORR(i,a,n) for(int i=(n); i>=(a); --i)

#define VDOUT(x) cerr << #x << "\n";for(auto i : x ) cerr << "  " << i << "\n";
#define DOUT(x) cerr << #x << " = " << x << "\n";

#define COUT(x) cout << (x) << "\n";
#define COUT2(x,y) cout << (x) << " " << (y) << "\n";
#define COUT3(x,y,z) cout << (x) << " " << (y) << " " << (z) << "\n"; 

#define INI ios::sync_with_stdio(false);cin.tie(0)


#define ALL(x) x.begin(),x.end()


signed main()
{
	INI;
	int cnt = 0;
	string a;
	REP(i, 3)
	{
		cin >> a;
		if (a == "RED")
			++cnt;
	}
	COUT(cnt<2?"BLUE":"RED");
	return 0;
}