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: ['N', 'O', '671', 'p', '853', 'w', '1987', '5871', 'q', '4649', 'j', 'p']

14, 15, 671, 16, 853, 23, 1987, 5871, 17, 4649, 10, 16