def is_kadomatsu(c1,c2,c3):
    if (c2>c1 and c2>c3) or (c2<c1 and c2<c3):
        return True
    else:
        return False

C = input().split()
trial = [1,4]
qi = -1

for i in range(3):
    try:
        C[i] = int(C[i])
    except ValueError:
        qi = i

res = ''
for k in trial:
    C_ = C[:]
    C_[qi] = k
    if is_kadomatsu(*C_):
        res += str(k)

print(res)