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: ['4867', 'm', '8257', 'X', '2199', 'L', 'V', '707', 'q', 'b', '1951', '9197', 'B', '6315', 'N', '9121', '6959', 'i', '3555', '2945', 'H', '5289', '4271', 'J', '1961', '33', 'Y', 'S']

4867, 13, 8257, 24, 2199, 12, 22, 707, 17, 2, 1951, 9197, 2, 6315, 14, 9121, 6959, 9, 3555, 2945, 8, 5289, 4271, 10, 1961, 33, 25, 19