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', 'a', 'i', '3723', 'I', 'M', 'p', '2555', '3385', 'f', '2659', '3557']

11, 14, 1, 9, 3723, 9, 13, 16, 2555, 3385, 6, 2659, 3557