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: ['k', '9155', '1983', 'R', 'd', '1473', 'D', 'Q', '8265', '1751', 'Q', '9467', '4869', 'X', 'v', '7673', '3557', '8477', 'B', '1167', 'C', '7681', 'L', '6235', 'd', '4221', '5439', 'U', 'L', 'U']

11, 9155, 1983, 18, 4, 1473, 4, 17, 8265, 1751, 17, 9467, 4869, 24, 22, 7673, 3557, 8477, 2, 1167, 3, 7681, 12, 6235, 4, 4221, 5439, 21, 12, 21