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: ['607', 'k', '7947', '4935', '3057', '1643', 'X', 'K', '387', 'U', '8679', 'C', '1415', '7903', 'V', 'Y', '8125', 'U', '1723', 'i', 'h', 'l', '349', 'Z', '2405', 'h', 'i', 'g', '9537', 'z']

607, 11, 7947, 4935, 3057, 1643, 24, 11, 387, 21, 8679, 3, 1415, 7903, 22, 25, 8125, 21, 1723, 9, 8, 12, 349, 26, 2405, 8, 9, 7, 9537, 26