def solution(xs):
    result = 1
    max_negative = 0
    for power in xs:
        if power == 0:
            continue
        result *= power
        if power < 0:
            if max_negative == 0:
                max_negative = power
            else:
                max_negative = max(max_negative, power)
    if max_negative < 0 and result < 0:
        result /= max_negative
    return str(result)

tests = [
        ([2, 0, 2, 2, 0], "8"),
        ([-2, -3, 4, -5], "60"),
        ([2, -3, 1, 0, -5], "30"),
        ]

for i, o in tests:
    result = solution(i)
    print (i, result == o, result, o)