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: ['C', '8819', '2649', '2829', '7261', '3871', 'Q', '1051', 'S', '8341', 'c', '8553', 'W', '9129', '3335']

3, 8819, 2649, 2829, 7261, 3871, 17, 1051, 19, 8341, 3, 8553, 23, 9129, 3335