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: ['V', 'E', '869', 'c', 'T', '6427', '3471', '641', 'b']

22, 5, 869, 3, 20, 6427, 3471, 641, 2