• wrong answer

Question related to mission Common Words

I would like to give some feedback about this task, t think checking answers is wrong because it accepts only answers in some fixed order, and this order is not fixed by any of arguments.

From: http://www.checkio.org/mission/common-words/solve/


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My Code:

def checkio(first, second):
    first_set = set(first.split(","))
    for x in second.split(","):
        if(x in first_set):
            s += x

    return s

#These "asserts" using only for self-checking and not necessary for auto-testing
if __name__ == '__main__':
    assert checkio(u"hello,world", u"hello,earth") == "hello", "Hello"
    assert checkio(u"one,two,three", u"four,five,six") == "", "Too different"
    assert checkio(u"one,two,three", u"four,five,one,two,six,three") == "one,three,two", "1 2 3"