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: ['Z', '7663', 'L', '5431', '2271', 'F', 'r', 'b', 'k', 'B', '1411', 'F', '829', 'D', 'o', 'o', 'l', '4825', '8697', 't']

26, 7663, 12, 5431, 2271, 6, 18, 2, 11, 2, 1411, 6, 829, 4, 15, 15, 12, 4825, 8697, 20