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: ['l', '8183', 'E', 'I', '3271', '4193', '8103', '7499', 'b', 'U', 'm', '3167', '4525']

12, 8183, 5, 9, 3271, 4193, 8103, 7499, 2, 21, 13, 3167, 4525