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', '1535', '2273', 'y', 'L', 'h', 'B', '9411', '3565', '4295', '9045', 'S', 'z', 'k', '1123', '3139', 'h']

9, 1535, 2273, 25, 12, 8, 2, 9411, 3565, 4295, 9045, 19, 26, 11, 1123, 3139, 8