# -*- coding: utf-8 -*-

s = [0] * 3
s[0] = input()
s[1] = input()
s[2] = input()

r = 0
b = 0

for i in range(3):
    if s[i] == "RED":
        r += 1
    else:
        b += 1

if r > b:
    print("RED")
else:
    print("BLUE")