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: ['5375', '9813', '4857', 'j', 'k', '3559', '1487', 'j', '5979']

5375, 9813, 4857, 10, 11, 3559, 1487, 10, 5979