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: ['3323', '2925', '4947', 'W', '841', '1187', 'B', '63', '8643', 'D', '5393', 'z', 'z', 'T', '893', '9627', 'U']

3323, 2925, 4947, 23, 841, 1187, 2, 63, 8643, 4, 5393, 26, 26, 20, 893, 9627, 21