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: ['8471', 'k', 'U', '337', '5235', 'i', '7959', '6309', 'e', 'I', 'g', 'N', '4701', 'L', 'H', '8921', '1469', '4307', '1433', 'E', '9403', 'X', 'Q', 'm', '6185']

8471, 11, 21, 337, 5235, 9, 7959, 6309, 5, 9, 7, 14, 4701, 12, 8, 8921, 1469, 4307, 1433, 5, 9403, 24, 17, 13, 6185