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: ['8453', 'V', 'k', 'q', 'D', '6263', '4373', '259', 'O', 'c', '8279', '4671', '3009', 'y', 'A', 'Y', 'W', '7775', '7031', 'S', '2857', '7785', '5793']

8453, 22, 11, 17, 4, 6263, 4373, 259, 15, 3, 8279, 4671, 3009, 25, 1, 25, 23, 7775, 7031, 19, 2857, 7785, 5793