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: ['7257', 'K', '7807', 'Y', 'D', 'k', '1009', 'Z', '9473', 'm', 'y', '2437', 'l', '9961', '5457', '3717', '1793']

7257, 11, 7807, 25, 4, 11, 1009, 26, 9473, 13, 25, 2437, 12, 9961, 5457, 3717, 1793