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: ['7837', 'q', 'o', 'A', 'U', 'X', '4531', 'd', '9581', '4499', 'g', 'Q', '9271', 'A', '6675', '1405', '5561', '829', 'd', '9915', 'G', '5909', '4731', 'p', 'X', 'j', '5221', '3851', 'J', 'C', 'N', '8007', 'w', '2429', '6583', 'l']

7837, 17, 15, 1, 21, 24, 4531, 4, 9581, 4499, 7, 17, 9271, 1, 6675, 1405, 5561, 829, 4, 9915, 7, 5909, 4731, 16, 24, 10, 5221, 3851, 10, 3, 14, 8007, 23, 2429, 6583, 12