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: ['d', '9641', 't', '5487', '4293', 'O', '897', '1587', '1855', '4599', '9167']

4, 9641, 20, 5487, 4293, 15, 897, 1587, 1855, 4599, 9167