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: ['975', 'K', '4747', '5019', 'v', '9285', '3815', '3253', 'q', 'D']

975, 11, 4747, 5019, 22, 9285, 3815, 3253, 17, 4