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: ['4207', '2891', 'L', '4189', '9733', 'q', 'n', '3439', '7655', 'N', 'd', '5305', '7317', 'C', '6155', '7375', 'B', '3829', 'C', '3293', '7389', '5495', 'Z', '5329', '9189', 's', '7277', '4815', 'k', '2447', '7507', 'w', 'w', 's', 'U', 'l', 'F', 't']

4207, 2891, 12, 4189, 9733, 17, 14, 3439, 7655, 14, 4, 5305, 7317, 3, 6155, 7375, 2, 3829, 3, 3293, 7389, 5495, 26, 5329, 9189, 19, 7277, 4815, 11, 2447, 7507, 23, 23, 19, 21, 12, 6, 20