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: ['7457', 'T', 'S', 'n', '9837', '9657', '3353', '963', '2051', 'g', '885', '1553', 'c', 'x', 'Q', '9557', '6413', 'c', 'O', '6833', 'y', '3707', 'e', 'd', '7765', '8963', '3907', 'B', 'W', 'j', 'c', 'j', 'w', '4647', '3807']

7457, 20, 19, 14, 9837, 9657, 3353, 963, 2051, 7, 885, 1553, 3, 24, 17, 9557, 6413, 3, 15, 6833, 25, 3707, 5, 4, 7765, 8963, 3907, 2, 23, 10, 3, 10, 23, 4647, 3807