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', 'O', 'n', 'l', 'L', '731', 'z', 'n', 'u', 'N', '9551', 'x', 'k', '6473', '5433', '8801', 'e', 'r', '5445', '4189', 'N', '9547', '2079', 'c']

20, 15, 14, 12, 12, 731, 26, 14, 21, 14, 9551, 24, 11, 6473, 5433, 8801, 5, 18, 5445, 4189, 14, 9547, 2079, 3