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: ['l', 'L', 'q', '6979', 'T', '2403', '75', 'd', 'w', '2069', 'l', 'b', 'v']

12, 12, 17, 6979, 20, 2403, 75, 4, 23, 2069, 12, 2, 22