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: ['2875', '2757', 'B', '317', 'P', '193', 'r', '1977', 'U', '5485', '3527', '583', '7159', 'L', 'v', 's', 'k', '7419', '7351', 'o', 'G', 'P', '5803', '7249', 'w']

2875, 2757, 2, 317, 16, 193, 18, 1977, 21, 5485, 3527, 583, 7159, 12, 22, 19, 11, 7419, 7351, 15, 7, 16, 5803, 7249, 23