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: ['p', 'D', '7699', '7955', 'K', '1689', '815', 'C', '1827', '1171', 'h', 'e', '5485', '5635', 'B', '835', 'k', 'H', '835', '8799', '6567', 'T', '405', '6875', 'I', 's', '2769', '6229', '6893', '841', 'I', '4031']

16, 4, 7699, 7955, 11, 1689, 815, 3, 1827, 1171, 8, 5, 5485, 5635, 2, 835, 11, 8, 835, 8799, 6567, 20, 405, 6875, 9, 19, 2769, 6229, 6893, 841, 9, 4031