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: ['2803', 'f', '9811', 'D', '2681', 'K', '4627', 'h', 'L', '7397', 'r', '9401', 'M', 'v', '405', 'C', '95', 'U', 'n', '1401', '5073']

2803, 6, 9811, 4, 2681, 11, 4627, 8, 12, 7397, 18, 9401, 13, 22, 405, 3, 95, 21, 14, 1401, 5073