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: ['7853', 'T', 'S', 'k', 'a', 'G', '7283', '4907', '7517', '8499', 'W', '1813', '3699', '1345']

7853, 20, 19, 11, 1, 7, 7283, 4907, 7517, 8499, 23, 1813, 3699, 1345