L = ['1', '4']
C = input().split()
for i in range(3):
	if C[i] == '?':
		for l in L:
			C[i] = l
			if C[0] != C[1] != C[2] and (max(C) == C[1] or min(C) == C[1]):
				print(l, end = '')
print()