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

R = 0
B = 0

if S1 == 'RED':
	R += 1
else:
	B += 1

if S2 == 'RED':
	R += 1
else:
	B += 1

if S3 == 'RED':
	R += 1
else:
	B += 1

if R > B:
	print("RED")
else:
	print("BLUE")