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: ['8431', '6669', 'W', 'A', '2737', 'k', '5233', '8997', '9845', 'Z', '5601', 'x', '9301', '209', 'k', 'h', '2907', 'T', 'b', 'Q', '4165', '291', '9155', 'D', '1517', 'W', 'C', '2459', '6209', 'J', 'p', '4451', '8589', '2369', 'm', 'Z', 'k', '4561', 'n']

8431, 6669, 23, 1, 2737, 11, 5233, 8997, 9845, 26, 5601, 24, 9301, 209, 11, 8, 2907, 20, 2, 17, 4165, 291, 9155, 4, 1517, 23, 3, 2459, 6209, 10, 16, 4451, 8589, 2369, 13, 26, 11, 4561, 14