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: ['425', '3085', 'A', '413', 'l', '7993', 'd', '9929', '4255', '1355', 'D', '2581', '3877', 'J', '3553', 'g', 'L', 'Z', '6225']

425, 3085, 1, 413, 12, 7993, 4, 9929, 4255, 1355, 4, 2581, 3877, 10, 3553, 7, 12, 26, 6225