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: ['8351', '6947', '4259', '2949', '8207', 'k', '6211', '3719', 'o', 'k', 'C', '1497', 'D', '3251', 'M', '1519', 'i', 'V', 'A', '4161', '1293', 'd', '6419', 'r']

8351, 6947, 4259, 2949, 8207, 11, 6211, 3719, 15, 11, 3, 1497, 4, 3251, 13, 1519, 9, 22, 1, 4161, 1293, 4, 6419, 18