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: ['K', '4893', 'H', '3053', '2791', '9929', 'V', 't', '2609', 'J', '485', '8557']

11, 4893, 8, 3053, 2791, 9929, 22, 20, 2609, 10, 485, 8557