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', '5857', '8903', 's', '4279', '9467', '6899', 's', 'C', 'a', 'X', '3227', '6411', '2127', '9023', '4919', '3275', '999', 'o', 'p', 'N', 'm', '4663', '5317', '8849', '895', '3425', 'S', '205']

15, 5857, 8903, 19, 4279, 9467, 6899, 19, 3, 1, 24, 3227, 6411, 2127, 9023, 4919, 3275, 999, 15, 16, 14, 13, 4663, 5317, 8849, 895, 3425, 19, 205