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: ['C', 'l', '1445', 'm', '5973', '8411', '4653', '7213', '4893', 'P', 'b', '5017', '4753', '679', '523', 'G', 's', 'b', 'P', 'q', '8705', 'a', 'B', '7913', 'T', '4865', '8039', '95', '8937', 'u', 'G', 'r', 'Q', 'i', '7497', 'c', '507', 'U', 'k']

3, 12, 1445, 13, 5973, 8411, 4653, 7213, 4893, 16, 2, 5017, 4753, 679, 523, 7, 19, 2, 16, 17, 8705, 1, 2, 7913, 20, 4865, 8039, 95, 8937, 21, 7, 18, 17, 9, 7497, 3, 507, 21, 11