I have not really analysed your code, but clearly there is a mismatch with types when multiplying "cost[0] * cost[1]", such as multiplying a numeric variable with a string. If you are unsure what happens on that line, you can print cost[0] and cost[1] before the multiplication/error.
TypeError: can't multiply sequence by non-int of type 'str'
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TypeError: can't multiply sequence by non-int of type 'str'
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