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: ['w', '4303', '4787', 'D', 'd', '5813', '3553', 'D', 'J', '1671', '8703', 'J', '3417', '4901', 'G', '3215', 'a', '6011', 'J', '7615', 'U', 'A', 'S', '8389', '3531']

23, 4303, 4787, 4, 4, 5813, 3553, 4, 10, 1671, 8703, 10, 3417, 4901, 7, 3215, 1, 6011, 10, 7615, 21, 1, 19, 8389, 3531