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: ['z', 'T', '6539', '4753', '9599', '2879', 'q', 'G', 'r', 'B', '1233', '1939', 'X', '4005', 'i', '8585', 'B', '2503', 'm', 'l', '4169', '805', '8221', 'M', 'D', 'N', '6359', '2817', '6441', '7501', '9015', 'I', 'I']

26, 20, 6539, 4753, 9599, 2879, 17, 7, 18, 2, 1233, 1939, 24, 4005, 9, 8585, 2, 2503, 13, 12, 4169, 805, 8221, 13, 4, 14, 6359, 2817, 6441, 7501, 9015, 9, 9