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: ['O', '7159', 'L', 'x', '7475', '8563', '2339', 'q']

15, 7159, 12, 24, 7475, 8563, 2339, 17