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: ['8983', 'y', 'q', 't', '2601', '7107', '1897', '3651', 'C', '393', 'P', 'R', '9', 'u', 'z', 'B', '2647']

8983, 25, 17, 20, 2601, 7107, 1897, 3651, 3, 393, 16, 18, 9, 21, 26, 2, 2647