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: ['R', 'J', '9349', '8271', 'v', 'R', 'L', 'f', '3529']

18, 10, 9349, 8271, 22, 18, 12, 6, 3529