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: ['4019', 'D', 'W', 'S', '9681', '8079', '4215', '2615', '2661', 'Z', '1123', '6997', '1509', 'm', 'y', '5619', '1857', 'v', '3565', 'l', '9249', '6743', '7647', '2323', 'B', 'f', '899']

4019, 4, 23, 19, 9681, 8079, 4215, 2615, 2661, 26, 1123, 6997, 1509, 13, 25, 5619, 1857, 22, 3565, 12, 9249, 6743, 7647, 2323, 2, 6, 899