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: ['b', 'V', 'k', 'b', '2947', 'B', 'U', 'J', '8305', '3171', '9043', 'l', '8693']

2, 22, 11, 2, 2947, 2, 21, 10, 8305, 3171, 9043, 12, 8693