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: ['D', 'g', 'o', '6601', 'L', 'Y', 'v', 'n', '2647', 'y', 'e', 'g', 'm', 'V', '3043']

4, 7, 15, 6601, 12, 25, 22, 14, 2647, 25, 5, 7, 13, 22, 3043