S1 = input()
S2 = input()
S3 = input()

red = 0
blue = 0
if S1 == "RED":
    red += 1
else:
    blue += 1
if S2 == "RED":
    red += 1
else:
    blue += 1
if S3 == "RED":
    red += 1
else:
    blue += 1

if red > blue:
    print("RED")
else:
    print("BLUE")