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: ['8137', '8925', '4409', 'N', 'H', '5009', 'k', '5661', 'd', 'k', '1335', 'n', 'z']

8137, 8925, 4409, 14, 8, 5009, 11, 5661, 4, 11, 1335, 14, 26