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', '8347', 'N', 'y', '4221', '523', 'U', 'k', '5033', '6571', 'v', 'T', '3873', '9117', 'e', 'b', 'x', 'k', 'l', '2181']

7, 8347, 14, 25, 4221, 523, 21, 11, 5033, 6571, 22, 20, 3873, 9117, 5, 2, 24, 11, 12, 2181