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: ['8659', '9255', '1825', '8075', 'l', 'Z', 'o', 'R', '7653', '8265', '5079', 'O', '5377', 'B', 'y', '1955', '9637', 'a', 'a', 'e', '2553']

8659, 9255, 1825, 8075, 12, 26, 15, 18, 7653, 8265, 5079, 15, 5377, 2, 25, 1955, 9637, 1, 1, 5, 2553