Implement function q2(string1, string2, num) so that it returns True if the input strings are the same length and differ at exactly num character positions, and returns False otherwise. NOTE: Use a simple loop comparing corresponding characters direclty. You may not use any string methods. For example

>>> q3("bat", "bet", 1) True

>>> q3("art", "rat", 1) False

>>> q3("art", "ran", 1) False

>>> q3("art", "rat", 2) True

>>> q3("art", "ran", 3) True

>>> q3("abcde", "abada", 2) True

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