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: ['2713', '7157', 'L', '1227', 'O', '2351', 's', '7729']

2713, 7157, 12, 1227, 15, 2351, 19, 7729