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: ['7843', 'C', '2189', '3567', 'd', 'Q', 'W']

7843, 3, 2189, 3567, 4, 17, 23