ls = input().split()
def  ok(lsl):
    if lsl[0] < lsl[1] and lsl[1] > lsl[2] and lsl[0] != lsl[2]:
        return True
    if lsl[0] > lsl[1] and lsl[1] < lsl[2] and lsl[0] != lsl[2]:
        return True
    return False
ans = ''
ls2 = []
for i in range(3):
    if ls[i] == '?':
        ls2.append(1)
    else:
        ls2.append(int(ls[i]))
if ok(ls2):
    ans += '1'
ls2 = []
for i in range(3):
    if ls[i] == '?':
        ls2.append(4)
    else:
        ls2.append(int(ls[i]))
if ok(ls2):
    ans += '4'
print(ans)