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: ['3563', '4255', 'w', 'U', 'W', '5941']

3563, 4255, 23, 21, 23, 5941