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: ['2519', '3909', 'a', 'D', '4429', 'N', '2511', '9803', 'O', '8793', '4221', 'I', 'i', 'J', 'O', '6517', 'V', 'M', 'w', '1197', '2169', '5097', 'U', 'Q']

2519, 3909, 1, 4, 4429, 14, 2511, 9803, 15, 8793, 4221, 9, 9, 10, 15, 6517, 22, 13, 23, 1197, 2169, 5097, 21, 17