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: ['5559', '3229', '3527', '6427', 'U', 'S', 'Z', 'P', 'B', 'F', '6229', 'F', '4003', 'C', 'r', '8631', '5547', '3769', '8383', '7597', '7687', '9131', '4437', 'P', '9755', 'N']

5559, 3229, 3527, 6427, 21, 19, 26, 16, 2, 6, 6229, 6, 4003, 3, 18, 8631, 5547, 3769, 8383, 7597, 7687, 9131, 4437, 16, 9755, 14