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: ['P', '6105', '4073', '6913', '5393', '1985', '9451', 'i', 'l', '9335', '6681', '2453', '4561', '1313', 'a', '1677', '7311', '3549', 'L', 'l', 'h', 'E']

16, 6105, 4073, 6913, 5393, 1985, 9451, 9, 12, 9335, 6681, 2453, 4561, 1313, 1, 1677, 7311, 3549, 12, 12, 8, 5