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: ['9423', 'P', 'W', 'm', 'W', '8777', '5479', 'w', '3639', '7605', '6561', 'g', '6735', '1877', 'l', '7621', 'r', 'O', 'g', '5239', '5685', 'f']

9423, 16, 23, 13, 23, 8777, 5479, 23, 3639, 7605, 6561, 7, 6735, 1877, 12, 7621, 18, 15, 7, 5239, 5685, 6