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: ['d', 'Y', 'M', 'M', '8669', 'T', '7811', 'A', 'Z', '6449', 'a', '4073', 'a', '9435', 'O', 'm', '5021', '7171', 'k', 'd', 'q', 'k', 'U', 't', '6461', '5673', '6737', 'T', '1759']

4, 25, 13, 13, 8669, 20, 7811, 1, 26, 6449, 1, 4073, 1, 9435, 15, 13, 5021, 7171, 11, 4, 17, 11, 21, 20, 6461, 5673, 6737, 20, 1759