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: ['9347', 'v', 's', '4055', '3789', 'q', 'O', 'X', '7553', 'm']

9347, 22, 19, 4055, 3789, 17, 15, 24, 7553, 13