Definition: 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.
Input: ['P', '9917', '8371', '1485', 'O', '1165', 't', '8113', 'F', '885', '9161', 'V', 'b', 'q', 'B', 'J', '5219', '5553', '4843', 'I', '3807', '3583']

16, 9917, 8371, 1485, 15, 1165, 20, 8113, 6, 885, 9161, 22, 2, 17, 2, 10, 5219, 5553, 4843, 9, 3807, 3583