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: ['5781', 'c', 'J', 'b', 'o', '7659', '5003']

5781, 3, 10, 2, 15, 7659, 5003