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', 'h', '1867', '5561', 'y', 'K', 'M']

11, 8, 1867, 5561, 25, 11, 13