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: ['4243', '3971', 'I', 'P', 'm', '5675', 'E', '201', '4119', 'k', 'r', 'Z']

4243, 3971, 9, 16, 13, 5675, 5, 201, 4119, 11, 18, 26