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: ['4781', '1065', 'J', '5609', '6059', '7951', 'W', 'A', '6089', '5589', '8079', '5333', '7707', '3553', '419', 'v', 'S', '7161', 'p', 'd', '5729', '3121', 'F', '4963', '8847', 'g', 'P', '1893', '9339']

4781, 1065, 10, 5609, 6059, 7951, 23, 1, 6089, 5589, 8079, 5333, 7707, 3553, 419, 22, 19, 7161, 16, 4, 5729, 3121, 6, 4963, 8847, 7, 16, 1893, 9339