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: ['785', 'K', 'D', '6263', 'g', 'l', 'P', '7573', 'p', '2131', 'c', '5', '8491', '2705', 'q', '3405', 'Z']

785, 11, 4, 6263, 7, 12, 16, 7573, 16, 2131, 3, 5, 8491, 2705, 17, 3405, 26