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: ['4867', 'Y', 't', '8365', 'f', '9409', 'H', '1913', 'J', 'F', 'w']

4867, 25, 20, 8365, 6, 9409, 8, 1913, 10, 6, 23