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: ['c', 't', 'd', '3723', '7725', '9639', 'h', 'n', '4717']

3, 20, 4, 3723, 7725, 9639, 8, 14, 4717