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: ['S', '195', '1471', 'j', '2747', '4875', 'k', '2957']

19, 195, 1471, 10, 2747, 4875, 11, 2957