import java.util.Scanner;

public class N516
{
	public static void main(String[] args)
	{
		Scanner sc=new Scanner(System.in);
		String [] S=new String[3];
		int red=0;
		int blue=0;
		String msg="";
		for(int i=0;i<3;i++)
		{
			S[i]=sc.next();
			if(S[i].equals("RED"))
			{red++;}
			else if(S[i].equals("BLUE"))
			{blue++;}
		}
		if(red>blue)
		{msg="RED";}
		else
		{msg="BLUE";}
		System.out.println(msg);
	}
}