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: ['6935', '1577', 'm', '5321', 'K', '5599', '9547', 'v', 'V', '7459', '6387']

6935, 1577, 13, 5321, 11, 5599, 9547, 22, 22, 7459, 6387