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: ['t', 'g', '4733', '4083', '9619', 'i', 'm', '2973', '585', 'R', '5043', '109', 'b', '8963', 'U', '2131', 'P', '8687', '531', '8289', '277', 'l', 'k', 'b', 'D', 'O', 's', 'D', '5151', 'L']

20, 7, 4733, 4083, 9619, 9, 13, 2973, 585, 18, 5043, 109, 2, 8963, 21, 2131, 16, 8687, 531, 8289, 277, 12, 11, 2, 4, 15, 19, 4, 5151, 12