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: ['3689', '3125', 'Q', 'M', 'O', 'T', 'N', 'B', 'i', 'd', 'H', 'b', 'B', '1147', '3901', 'w', '2353', '8403', 't', 'S', '7599', 'n', '1999', '5317', 'D', 's', '9199']

3689, 3125, 17, 13, 15, 20, 14, 2, 9, 4, 8, 2, 2, 1147, 3901, 23, 2353, 8403, 20, 19, 7599, 14, 1999, 5317, 4, 19, 9199