---

a = input()
b = input()
c = input()
if a =="black" and b =="black" and c == "green":
    print('black')
    print('black')
    print('GREEN')
elif a =="black" and b =="black" and c == "GREEN":
    print('black')
    print('yellow')
    print('black')
elif a =="black" and b =="yellow" and c == "black":
    print('red')
    print('black')
    print('black')
elif a =="red" and b =="black" and c == "black":
    print('red')
    print('yellow')
    print('black')
elif a =="red" and b =="yellow" and c == "black":
    print('black')
    print('black')
    print('green')
elif a =="black" and b =="YELLOW" and c == "black":
    print('black')
    print('YELLOW')
    print('black')
else:
    print('error')