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', '7799', '7841', '4673', '4329', 'U', '6385', '5063', '2799', '2393', '1705', 'r', '977', 'm', 'M', '2569', '6145', '6871', '8093', '3113', '6367', 'K', '2541', '3617', '4827', 'E', 'U', '2401', 'E', '1595', '5347', 'u']

4, 7799, 7841, 4673, 4329, 21, 6385, 5063, 2799, 2393, 1705, 18, 977, 13, 13, 2569, 6145, 6871, 8093, 3113, 6367, 11, 2541, 3617, 4827, 5, 21, 2401, 5, 1595, 5347, 21