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: ['O', '8163', 'J', '4527', '8983', '5985', '7391', '6345', '4717', 'A', 'z', '2519', '731', '6887', '335', 'A', 's', '9713', '3097', '2933', '2743', 'S', '2197', 'R', '9895', 'Q']

15, 8163, 10, 4527, 8983, 5985, 7391, 6345, 4717, 1, 26, 2519, 731, 6887, 335, 1, 19, 9713, 3097, 2933, 2743, 19, 2197, 18, 9895, 17