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: ['U', '4407', '6275', 'y', 'q', 'd', 'G', '5731', '7919', '9893', '4181', '7225', '9261', '5337', 'i', '9627', '1373', '5623', 'Z', '7765', 'B', '8175', 'S', 'o', '1947', '5649', 'Q', 'd', '2547', '1259', '5707', '4691', '1395', '1469', 'z', '5259', 'T', 'z', '8663']

21, 4407, 6275, 25, 17, 4, 7, 5731, 7919, 9893, 4181, 7225, 9261, 5337, 9, 9627, 1373, 5623, 26, 7765, 2, 8175, 19, 15, 1947, 5649, 17, 4, 2547, 1259, 5707, 4691, 1395, 1469, 26, 5259, 20, 26, 8663