import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

C = read().split()

def test(x):
    A = C[:]
    for i in range(3):
        if A[i] == b'?':
            A[i] = x
        else:
            A[i] = int(A[i])
    a,b,c = A
    return (a>b<c) or (a<b>c)

answer = ''.join(str(x) for x in [1,4] if test(x))
print(answer)