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: ['K', 'q', '2911', '5971', '5437', '3997', '9881', 'U', '3151', 'o', '4225', '7599', 'E', '7043', 'D', '5315', '9609', '7529']

11, 17, 2911, 5971, 5437, 3997, 9881, 21, 3151, 15, 4225, 7599, 5, 7043, 4, 5315, 9609, 7529