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: ['O', 'p', 'E', 'a', '9611', '8745', '5349', '5583', 'h', 'D', '7669', 'X', 'y', '7175', 'r', 'D', '2171', 'L', 'F', '9385', 'H', '7153', '6533', '7109', 'y', '6333', '8637', '8287', '8495', '2799', 'u', 'l', '4439', '1963', '5809', '8399', '727', 'w']

15, 16, 5, 1, 9611, 8745, 5349, 5583, 8, 4, 7669, 24, 25, 7175, 18, 4, 2171, 12, 6, 9385, 8, 7153, 6533, 7109, 25, 6333, 8637, 8287, 8495, 2799, 21, 12, 4439, 1963, 5809, 8399, 727, 23