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: ['y', '4695', '2093', '1929', 'm', '969', 'U', '8961', '7833']

25, 4695, 2093, 1929, 13, 969, 21, 8961, 7833