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: ['4439', 'r', '7441', 'e', '5641', '1893', 'r', 'G', 'm', 'f', '4705', 'W', '4555', '5447', 'D', '5511', '4609', '2419', '9269', 'e', '9915', 't', '7261', '9565', '8597']

4439, 18, 7441, 5, 5641, 1893, 18, 7, 13, 6, 4705, 23, 4555, 5447, 4, 5511, 4609, 2419, 9269, 5, 9915, 20, 7261, 9565, 8597