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: ['u', 'O', 'w', 'I', '2161', '1377', 'd', '143', 'L', '107', 'N', 'a', '2899', '1191', '4797', 'p', '8729', 'z', 'I', '6569', '4179', 'R', 'E', 'V', 'X', 'm', 'I', '6737', '1119', 'B', '2689', '3609']

21, 15, 23, 9, 2161, 1377, 4, 143, 12, 107, 14, 1, 2899, 1191, 4797, 16, 8729, 26, 9, 6569, 4179, 18, 5, 22, 24, 13, 9, 6737, 1119, 2, 2689, 3609