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: ['R', 'B', '6719', '2413', '2499', '4477', 'i', 'e', '419', '8429', 'k', 'M', '5805', '8011', 'U', 'N', '8383', 'd', '8191', 'P', 'k', 'G', '7093', 'n', '2599', '9177', 'Q', '6859', '5189', '9361', '1569', '1321', 'v', '2229', 'O', '2495']

18, 2, 6719, 2413, 2499, 4477, 9, 5, 419, 8429, 11, 13, 5805, 8011, 21, 14, 8383, 4, 8191, 16, 11, 7, 7093, 14, 2599, 9177, 17, 6859, 5189, 9361, 1569, 1321, 22, 2229, 15, 2495