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: ['l', 'k', '1437', 'Y', '8733', '2731', '7731', 'Z', 'D', 'e', 'J', '6643', 'X', '6305', '8069', 'S', 'o', 'K', '8065', '3377', '269', 'M', 'J', '2699', 'h', 'N', '4583', '5637', '5185', '721', '2553', 'T', '2563', 'W', 'K', 'b']

12, 11, 1437, 25, 8733, 2731, 7731, 26, 4, 5, 10, 6643, 24, 6305, 8069, 19, 15, 11, 8065, 3377, 269, 13, 10, 2699, 8, 14, 4583, 5637, 5185, 721, 2553, 20, 2563, 23, 11, 2