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', 'k', 'Y', '9531', 'V', 'l', '9389', 'C', '2851']

23, 11, 25, 9531, 22, 12, 9389, 3, 2851