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: ['7393', 'w', '8211', '4263', 'y', 't', '3505', 'O']

7393, 23, 8211, 4263, 25, 20, 3505, 15