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: ['T', 'z', 'm', 'w', '8401', 'D', 'r', '6971', 'C', 'U', 'l', '3691', '6951', '2937', 'q', 'N', 'T', 'j', 'w', '3265', 'J', '7551', '9405', 'I', '5983', '529', 'N', 'D', 'Z', '1857', '1285', 'Y', 'a']

20, 26, 13, 23, 8401, 4, 18, 6971, 3, 21, 12, 3691, 6951, 2937, 17, 14, 20, 10, 23, 3265, 10, 7551, 9405, 9, 5983, 529, 14, 4, 26, 1857, 1285, 25, 1