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: ['k', 'O', 'A', 'w', 'q', 'S', 'w', 'k', 'F', '9639', 'U', 'O', '3217', '8709']

11, 15, 1, 23, 17, 19, 23, 11, 6, 9639, 21, 15, 3217, 8709