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: ['4573', '403', 'I', 'g', 'E', 'Z', 'w', 'H', '1537', 'b', '8899', 'B', 'K', '9263', 'm', '9293', 'L', '8417', 'b', '1417', '8191', 'U', 'a', 'y', '2583', '6937', 'A', 'p', '9975', 'Y', 'e', 'M', '103', '9779', 'L', 'Z', 'Z', 'a', 'v', 'M']

4573, 403, 9, 7, 5, 26, 23, 8, 1537, 2, 8899, 2, 11, 9263, 13, 9293, 12, 8417, 2, 1417, 8191, 21, 1, 25, 2583, 6937, 1, 16, 9975, 25, 5, 13, 103, 9779, 12, 26, 26, 1, 22, 13