How to use user input into defined function? [closed]

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It keeps giving me " unsupported operand type(s) for -: 'str' and 'str' " error. If I directly defined the points for start and end in the code it works but not when I try the input function.

I don't understand why it won't use the user input for the function even when I change it into a tuple, a list, or an integer.