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: ['l', '4541', 'k', '8379', '9561', '5863', 'A', 'L', 'q', '2653', '7195', '7777', 'q', '2505', '8125', '8379', '5273', '4877', 'S', '7063', 'q', 'X', 'H', 'I', 'u']

12, 4541, 11, 8379, 9561, 5863, 1, 12, 17, 2653, 7195, 7777, 17, 2505, 8125, 8379, 5273, 4877, 19, 7063, 17, 24, 8, 9, 21