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: ['4309', '7955', 'n', '4055', 'Y', '7343', 'o']

4309, 7955, 14, 4055, 25, 7343, 15