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: ['Q', '7971', 'P', 'z', 'H', '407', 'A', '8983', '9209', 'Q', 'N', '3549', '8003', '993', '4275', '5757', '3671', 'L', 'k', 'N', 'f', 'D', 'H', '1653', '3653']

17, 7971, 16, 26, 8, 407, 1, 8983, 9209, 17, 14, 3549, 8003, 993, 4275, 5757, 3671, 12, 11, 14, 6, 4, 8, 1653, 3653