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: ['I', '3865', 'I', 'J', 'E', '3811', 'L', '7177', '7439', 'r', '5449', '9995', 'l', 'p', '4459', '1119', 'z', '6741', 'k', '7443', 'w', 'l', 'p', '1015', '5557', 'E', 'U', '5427', 'F']

9, 3865, 9, 10, 5, 3811, 12, 7177, 7439, 18, 5449, 9995, 12, 16, 4459, 1119, 26, 6741, 11, 7443, 23, 12, 16, 1015, 5557, 5, 21, 5427, 6