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: ['K', 'W', 'k', 'B', '1919', 'a', 'D', 'L', '6473', '1937', 'z', 'b', '1343', '5213', 'H', '4479', '3635', '3007', '8737', 's', 'f', 'j', '9045', 'S', 'z']

11, 23, 11, 2, 1919, 1, 4, 12, 6473, 1937, 26, 2, 1343, 5213, 8, 4479, 3635, 3007, 8737, 19, 6, 10, 9045, 19, 26