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: ['p', 'u', 'o', '8191', '7885', '3813', '6343', '5127', 'n', 'B']

16, 21, 15, 8191, 7885, 3813, 6343, 5127, 14, 2