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', 'n', 'S', 'J', 'G', '129', '2153', '6095', '8267']

11, 14, 19, 10, 7, 129, 2153, 6095, 8267