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: ['6311', '1009', 'F', 'H', '8859', 'z', 'k', 'Y']

6311, 1009, 6, 8, 8859, 26, 11, 25