RED, BLUE = 0, 0
S1 = input()
if S1 == "RED":
  RED += 1
else:
  BLUE += 1
S2 = input()
if S2 == "RED":
  RED += 1
else:
  BLUE += 1
S3 = input()
if S3 == "RED":
  RED += 1
else:
  BLUE += 1
if RED < BLUE:
  print("BLUE")
else:
  print("RED")