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', '157', '1019', '8669', 'J', 'f', '39', 'O', 'J', '5749', '8559', 'o', 'D', '7599', '8367', 'N', 'G', '5019', '3385', '9481', '7945', '6751', '3673']

25, 157, 1019, 8669, 10, 6, 39, 15, 10, 5749, 8559, 15, 4, 7599, 8367, 14, 7, 5019, 3385, 9481, 7945, 6751, 3673