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', '2603', '6865', 'U', 'J', 'N', '4577', '7853', '8933', '5295', '6389', '4033', '8887', '6585', '3577', 'D', '1301', 'B', 'M', 'Q', 'q', '2299', '8215', 'm', '3893', 'G', '4791']

21, 2603, 6865, 21, 10, 14, 4577, 7853, 8933, 5295, 6389, 4033, 8887, 6585, 3577, 4, 1301, 2, 13, 17, 17, 2299, 8215, 13, 3893, 7, 4791