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: ['6713', 'E', '7735', '5159', '9951', '5003', 'b']

6713, 5, 7735, 5159, 9951, 5003, 2