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: ['2779', 'L', '1785', 'Y', '1577', 'Q', '1693', '5075', 'Y', 'b', 'Q', '3079', '6565', '6693', 'd']

2779, 12, 1785, 25, 1577, 17, 1693, 5075, 25, 2, 17, 3079, 6565, 6693, 4