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: ['9873', 'h', 'e', 'd', 'w', 'W', '6923', '3755', 'a', '2497', '9497', 'G', '2667', '5571', '4451', 'j', '2787', 'G', 'z', '217', '589', 'k', '3821', 'T', 'Y', 'c', '9319', '5285', 'W', '5181']

9873, 8, 5, 4, 23, 23, 6923, 3755, 1, 2497, 9497, 7, 2667, 5571, 4451, 10, 2787, 7, 26, 217, 589, 11, 3821, 20, 25, 3, 9319, 5285, 23, 5181