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: ['3419', 'I', 'F', 'a', 'w', 'V', '5887', 'W', '2681', '1765', 'r', 'G', '6135', '4323', '4387']

3419, 9, 6, 1, 23, 22, 5887, 23, 2681, 1765, 18, 7, 6135, 4323, 4387