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: ['4017', 'W', 'R', '2055', '3361', '9725', 'N', 'k', '5121', '8929']

4017, 23, 18, 2055, 3361, 9725, 14, 11, 5121, 8929