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: ['4911', '4225', '6035', 'y', '5299', 'b', 'c', '1931', 'a', '517', 'D', '2333', 'Q', 'm', '4047', 'n', '3617', 'h', 'Y', '1487', 'n', '2483', '9297', 'x', 'N', 'D', 'H', '8417', 'k', 'h', 'n', '9737', 'R', 'i', '455', 'R', 'Y']

4911, 4225, 6035, 25, 5299, 2, 3, 1931, 1, 517, 4, 2333, 17, 13, 4047, 14, 3617, 8, 25, 1487, 14, 2483, 9297, 24, 14, 4, 8, 8417, 11, 8, 14, 9737, 18, 9, 455, 18, 25