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: ['517', '9459', 'S', 'W', '6595', '2115', '6289', 'J', 'b', '1137', 'g', 'g', '4477', 'n', '7549', 'Z', 'z', '1459', '9723', 'P', '8375', 'U', 'O', 'W', 'j', 'y', 'T', '363', '2969', 'D', 'F', '5227', '6987', '6235', 'L', 'n', '8319']

517, 9459, 19, 23, 6595, 2115, 6289, 10, 2, 1137, 7, 7, 4477, 14, 7549, 26, 26, 1459, 9723, 16, 8375, 21, 15, 23, 10, 25, 20, 363, 2969, 4, 6, 5227, 6987, 6235, 12, 14, 8319