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: ['h', 'P', 'X', '7381', '6029', 'n', 'U', '7013', 'W']

8, 16, 24, 7381, 6029, 14, 21, 7013, 23