c = list(input().split())

answer = ""

for i in range(3):
	if c[i] == "?":
		c[i] = int(1)
	else:
		c[i] = int(c[i])

if min(c) == c[1] or max(c) == c[1]:
	answer += "1"
	
for i in range(3):
	if c[i] == 1:
		c[i] = 4

if min(c) == c[1] or max(c) == c[1]:
	answer += "4"
	
print(answer)