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: ['5445', '5961', 'Y', 'E', '8771', '6475', 'P', '5947', '4139']

5445, 5961, 25, 5, 8771, 6475, 16, 5947, 4139