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: ['U', '3971', '3533', '567', 'y', 'J', '4935', '1671', '5477', 'M', 'm', '6301', 'G', '4531', 'h', '9785', 'F', 'O', 'K', 'g', 'W', 'i', 'G', 'a', '8017', '1593', 'P', 'x', '9753', '673', '2841']

21, 3971, 3533, 567, 25, 10, 4935, 1671, 5477, 13, 13, 6301, 7, 4531, 8, 9785, 6, 15, 11, 7, 23, 9, 7, 1, 8017, 1593, 16, 24, 9753, 673, 2841