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: ['c', '8285', 'X', '8487', '8409', '6239', '3113', 'l', '1001', '531', '8485', '4915', 'w', '923', 'd', '5645', '7699', 'Y', '6023', 's']

3, 8285, 24, 8487, 8409, 6239, 3113, 12, 1001, 531, 8485, 4915, 23, 923, 4, 5645, 7699, 25, 6023, 19