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: ['y', 'u', '9561', 'r', 'm', 'E', '3123', '531', '9877', 'u', '5023', '3829', '831', '8977', '9023', 'u', 'j', 'j', '1601', 'H', 'n', 'v', 'u', 'O', '2907', 'F', 'V', 'n', '3691']

25, 21, 9561, 18, 13, 5, 3123, 531, 9877, 21, 5023, 3829, 831, 8977, 9023, 21, 10, 10, 1601, 8, 14, 22, 21, 15, 2907, 6, 22, 14, 3691