#include <iostream>
#include <string>
int main()
{
	// 3.赤と青の風船_516|
	std::string barun = "";
	int a = 0, b = 0;
	for (int i = 0;i < 3; i++)
	{
		std::cin >> barun;
		if (barun == "RED")
		{
			a++;
		}
		else if (barun == "BLUE") 
		{
			b++;
		}
		else{}
		barun = "";
	}
	if (a > b)
	{
		std::cout << "RED" << std::endl;
	}
	else if (b > a)
	{
		std::cout << "BLUE" << std::endl;
	}
	else{}
	return 0;
}