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: ['3229', 'J', 'f', 'T', 'H', '1817', 'z', '5769', 'E', 'v', '3661', 'Y', 's', '4679', 'J', 'o', '9547', 'M', 'O', '9421']

3229, 10, 6, 20, 8, 1817, 26, 5769, 5, 22, 3661, 25, 19, 4679, 10, 15, 9547, 13, 15, 9421