#include <iostream>
#include <string>
using namespace std;
int main()
{
	string ar[3];
	int a=0;
	for (int i = 0; i < 3; i++)
	{
		cin >> ar[i];
		if (ar[i] == "RED") a++;
	}
	if (a >= 2) cout << "RED" << endl;
	else cout << "BLUE" << endl;
	return 0;
}