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: ['7403', 'O', 'K', 'q', 'Y', '9073', 'C', '3597', '7401', '4771', '6647', 'P', 'G', '9833', 'G', '6461', 'd', 'W', 'G', '1495', '5469']

7403, 15, 11, 17, 25, 9073, 3, 3597, 7401, 4771, 6647, 16, 7, 9833, 7, 6461, 4, 23, 7, 1495, 5469