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.

['Y', 'I', 'B', 'U', 'f', '5835', 'l', 'D', '3619', '5459', 'w', 'N', 'D', '7649', 'L', '8443', 'l', 's', 'm', 'K', 'L', '1997', '8041', '5875', 'L', 'r']
25, 9, 2, 21, 6, 5835, 12, 4, 3619, 5459, 23, 14, 4, 7649, 12, 8443, 12, 19, 13, 11, 12, 1997, 8041, 5875, 12, 18

['4245', '3997', 'T', 'N', 'q', '7057', '791', 't']
4245, 3997, 20, 14, 17, 7057, 791, 20

['O', '4243', '8209', 'r', '6785', '4485', '8635', '2153', '8571', '7563', 'm', 'g', 'i', 'Y', '1567']

15, 4243, 8209, 18, 6785, 4485, 8635, 2153, 8571, 7563, 13, 7, 9, 25, 1567