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: ['o', '9739', '2111', '2885', '6649', 'Y', 'd', 's', '8479', '8591', '5925', 'O', 'D', '1975', 'R', '8431', 'V', '6197', 'K', '11', '7653']

15, 9739, 2111, 2885, 6649, 25, 4, 19, 8479, 8591, 5925, 15, 4, 1975, 18, 8431, 22, 6197, 11, 11, 7653