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: ['8015', '8443', '215', '1517', '9861', '1341', 'Y', '5921', 'f', 'f', '3697', '9291', '4931', '8807', 'x', 'i']

8015, 8443, 215, 1517, 9861, 1341, 25, 5921, 6, 6, 3697, 9291, 4931, 8807, 24, 9