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: ['G', 'k', '8739', 'Y', 'C', '8063', 'o', 'Q']

7, 11, 8739, 25, 3, 8063, 15, 17