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', '2451', 'c', '8467', 'S', '7951', '8645', 'V', 'a', 'm', 'Q', '85', '445', '1547', '897', 'g', '8635', 'm', '2431', '305', 'J', 'w', 'u', '4471']

4, 2451, 3, 8467, 19, 7951, 8645, 22, 1, 13, 17, 85, 445, 1547, 897, 7, 8635, 13, 2431, 305, 10, 23, 21, 4471