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: ['Y', 'e', '7133', '3601', 'A', '8799', 'd', 'o', '8885', 'W', '5043', '853', '3467', 'o', '5275', 'U', '4091']

25, 5, 7133, 3601, 1, 8799, 4, 15, 8885, 23, 5043, 853, 3467, 15, 5275, 21, 4091