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', '9467', '6551', '9593', '8465', '1343', '5265', '1229', '9643', 'C', '7413', '7689', 'n', 'M', '6887', '9423', 'd', 'l', 'V', '337', 'N', '5019', '3599', '4839', 'B', '6607', 'P', '3947', 'W', '4461', 'i', 'O', 'S', '8551']

4, 9467, 6551, 9593, 8465, 1343, 5265, 1229, 9643, 3, 7413, 7689, 14, 13, 6887, 9423, 4, 12, 22, 337, 14, 5019, 3599, 4839, 2, 6607, 16, 3947, 23, 4461, 9, 15, 19, 8551