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: ['7891', 'k', 'W', 'J', '4021', 'k', 'C', '3795', 'D', '4847', '7935']

7891, 11, 23, 10, 4021, 11, 3, 3795, 4, 4847, 7935