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: ['O', 'z', 'i', 'o', 'T', '455', 'G', '8193', '7227', 'O', '1367', '8015', '7081', '3137']

15, 26, 9, 15, 20, 455, 7, 8193, 7227, 15, 1367, 8015, 7081, 3137