You'll write a function altSum(1st: list[int]) -> int that takes a list of numbers and returns the alternating sum of the numbers in the list (the operators alternate between addition and subtraction, starting with addition). For example: • altSum([]) returns 0. • altSum([1,3,5,2]) returns 1 (that is, 1+3- 5+2). • altSum([7,7,7,7]) returns 14 (that is, 7+7–7+7). • altSum([31,4,28,5,71]) returns -59 (that is, 31 +4– 28+5– 71).

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