It frustrates you more than you'd like to admit that the modulus operator in Python can be applied to non-integer values. When you write a code, you expect the result of the modulus operator to always be an integer, but thanks to Python it's not necessarily true.
To fix this, you decided to write your own modulus operator as a function. Your task is to implement a function that, given a number n, returns -1 if this number is not an integer and n % 2 otherwise. It is guaranteed that if the number represents an integer, it will be written without decimal point.
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