In this task, you are given an input list A. You need to convert all the alphabets in the list with a number representing their position in the English alphabet. E.g., replace A by 1, B by 2, a by 1, b by 2, and so on.

['6513', '9497', '8963', 'E']
6513, 9497, 8963, 5

['m', '6497', 'F', '1001', 'H', '5961', 'e']
13, 6497, 6, 1001, 8, 5961, 5

['b', 'H', '7415', 'k', 'U', 'F', 'b', '3823', '7877', 'Q', '3029', '4517', 'D', 'Y', '9243']

2, 8, 7415, 11, 21, 6, 2, 3823, 7877, 17, 3029, 4517, 4, 25, 9243