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: ['U', '5865', 'k', 'F', 'h', 'y', '4285', '7233', 'K', '3531', '1663', 'P', 'j', 'k', 'n', 'c', 'V', '9109', '679', '7279', '7171', 'H', '4715', '9557']

21, 5865, 11, 6, 8, 25, 4285, 7233, 11, 3531, 1663, 16, 10, 11, 14, 3, 22, 9109, 679, 7279, 7171, 8, 4715, 9557