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: ['6591', '7649', 's', '7727', '7351', 'Y', 'k', 'a', 'b', 'j', 'i', '7103', 's', '6851', 'B']

6591, 7649, 19, 7727, 7351, 25, 11, 1, 2, 10, 9, 7103, 19, 6851, 2