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', '8487', '8657', '6911', '3749', 'D', '3145', '6589', 'p', '7763', 'D', '5683', 'D']

11, 8487, 8657, 6911, 3749, 4, 3145, 6589, 16, 7763, 4, 5683, 4