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', '1929', '6247', '9269', '3745', '9821', '7057', '539', '3383', '2069', 'B', '1975', 't', 'G', '961', 'K', 'b', 't', 'O', 'M', 'f', 'd', '3779', 'L', 'u', '3825', '8833']

14, 1929, 6247, 9269, 3745, 9821, 7057, 539, 3383, 2069, 2, 1975, 20, 7, 961, 11, 2, 20, 15, 13, 6, 4, 3779, 12, 21, 3825, 8833