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: ['8549', 'm', 'e', 'k', 'U', '525', '6769', '9073', '3157', 'b', 'K', '6039', '8611', '137', '1679', '7279', '6935', '1125', '8633', 'F', '6481', '9035', '531']

8549, 13, 5, 11, 21, 525, 6769, 9073, 3157, 2, 11, 6039, 8611, 137, 1679, 7279, 6935, 1125, 8633, 6, 6481, 9035, 531