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: ['D', '463', 'f', '2829', '9281', 'U', 'v', 'q', '9721', 'S', '4875', '7015', '7653', 'n', 'q', '7989', '2361', '1075', 'O', 'Q', '6017', 'i', 'c', 'y', '2079']

4, 463, 6, 2829, 9281, 21, 22, 17, 9721, 19, 4875, 7015, 7653, 14, 17, 7989, 2361, 1075, 15, 17, 6017, 9, 3, 25, 2079