a = int(input())
b = int(input())
c = int(input())
if a > b > c:
	print("A\nB\nC")
elif a > c > b:
	print("A\nC\nB")
elif b > a > c:
	print("B\nA\nC")
elif b > c > a:
	print("B\nC\nA")
elif c > a > b:
	print("C\nA\nB")
else:
	print("C\nB\nA")