a=input()
b=input()
c=input()
count=0 #red
num=0 #blue
if a=="RED":
    count+=1
else:
    num+=1
if b=="RED":
    count+=1
else:
    num+=1
if c=="RED":
    count+=1
else:
    num+=1

if count<num:
    print("BLUE")
else:
    print("RED")