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: ['5857', 'H', 'e', '8581', '5495', 'S', '8441', '4453', 'F', '4641', '4957', '1445', '3775', 'p', 'x', 'A', '6839', 'l', '5731', '7573', 'P', 'I', 'l', '1209', 'O', 'y', '3351']

5857, 8, 5, 8581, 5495, 19, 8441, 4453, 6, 4641, 4957, 1445, 3775, 16, 24, 1, 6839, 12, 5731, 7573, 16, 9, 12, 1209, 15, 25, 3351