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: ['9253', '787', '245', 'a', '8057', 'f', '4521', 'J', 'U', '5475', '4911', 'G', 'j', '3065', 'l', '1263', 'a', '3785', '7487', 'l', '9181', '4303', 'c', 'K', 'U', 'F', '6057', '2833', 'o', 'A', '9595', '2657', 'D', '9213', '2229', '3315', 'n']

9253, 787, 245, 1, 8057, 6, 4521, 10, 21, 5475, 4911, 7, 10, 3065, 12, 1263, 1, 3785, 7487, 12, 9181, 4303, 3, 11, 21, 6, 6057, 2833, 15, 1, 9595, 2657, 4, 9213, 2229, 3315, 14