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: ['X', '401', 'F', 'n', '875', 'j', 'a', 'C', '4043', '4659', '7989', 'Q', '625', '8629', 'q', '8283', 'u', '7849', '797', '9867', 'P', 'E', '7031', '5839', 'a', 'A', 'X', '6149', 'u', 'E', '7839', 'N']

24, 401, 6, 14, 875, 10, 1, 3, 4043, 4659, 7989, 17, 625, 8629, 17, 8283, 21, 7849, 797, 9867, 16, 5, 7031, 5839, 1, 1, 24, 6149, 21, 5, 7839, 14