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: ['9729', 'M', 'V', 'O', '3707', '1705', 'x', '5365', 'S', '2631']

9729, 13, 22, 15, 3707, 1705, 24, 5365, 19, 2631