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', 's', '6273', '2271', '3311', '6329', 'J', '3011', 'e', '7079', '6177', '8489', 'i', 'I', 'y', 'A', 'D']

15, 19, 6273, 2271, 3311, 6329, 10, 3011, 5, 7079, 6177, 8489, 9, 9, 25, 1, 4