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: ['8159', '5861', 'z', 'F', 'S', '1527', '2971', '3311', '337']

8159, 5861, 26, 6, 19, 1527, 2971, 3311, 337