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: ['3887', 'k', '4343', '6365', 'L', 'l', '1963', 'p', '5159', 'v', 'L', '9643', '2491', '4579']

3887, 11, 4343, 6365, 12, 12, 1963, 16, 5159, 22, 12, 9643, 2491, 4579