import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class No516{
	public static void main(String[] args) {
		try {
			BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
			String[] str = new String[3];
			setColor(br, str);
			getColor(str);
			System.out.println(getColor(str));
			
		} catch (IOException e) {
			e.getStackTrace();
		}
	}
	
	public static void setColor(BufferedReader br, String[] s) throws IOException {
			for(int i=0; i<3; i++)
				s[i] = br.readLine();
	}
	
	public static String getColor(String[] s){
		int RED = 0;
		int BLUE = 0;
		for(int i=0; i<s.length; i++){
			if(s[i].equals("RED")) RED++;
			else BLUE++;
		}
		if(RED > BLUE) return "RED";
		else return "BLUE";
	}
	
}