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: ['x', '3507', 'm', '9081', '7743', '4153', 'D', '6191', 'q', '1291', '6677', 'J', 'e', '7699', '1597', 'c', '1595', 'u', 't', '2513', 'u', 'j', 'Y', 'i', '4283', 'i']

24, 3507, 13, 9081, 7743, 4153, 4, 6191, 17, 1291, 6677, 10, 5, 7699, 1597, 3, 1595, 21, 20, 2513, 21, 10, 25, 9, 4283, 9