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: ['J', '1971', '3523', '5195', 'J', 'j', '9763', 'h', 'W', '2987', 'U', 'O', '1459', '2215', 'i', 'V', '6381', '1399', '3077', '6591', '8081', 'C', 'O', 'J', '7485', '4975', '2349', '8845', 'J', '5883', '3093', '2275', '8439', 'h', 'E', '8975']

10, 1971, 3523, 5195, 10, 10, 9763, 8, 23, 2987, 21, 15, 1459, 2215, 9, 22, 6381, 1399, 3077, 6591, 8081, 3, 15, 10, 7485, 4975, 2349, 8845, 10, 5883, 3093, 2275, 8439, 8, 5, 8975