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: ['4237', 'W', '6097', 'q', '6911', 'T', '1387', '9509', 'X', 'e', 'E', 'S', 'a', '4509', 'e', '4091', 'M', 'k', '6697', 'S', '2481', 'l']

4237, 23, 6097, 17, 6911, 20, 1387, 9509, 24, 5, 5, 19, 1, 4509, 5, 4091, 13, 11, 6697, 19, 2481, 12