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: ['S', '9421', '8625', 'E', '7057', 'G', 'K', 'G', 'h', 'k', 's', '4875', '2223', 's', '1651', '4815', '4429', 'n']

19, 9421, 8625, 5, 7057, 7, 11, 7, 8, 11, 19, 4875, 2223, 19, 1651, 4815, 4429, 14