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: ['R', '6267', '843', 'Y', '9339', '7613', 'R', 'q', '8131', 'a', '3965', 'D', 'r', 'z', '3615', 'R', '5691', '5837', '2955', 'F', 'h', '9589', '9263', '1919', '8561', '3669', 'i', '3879', '6955', '7987', '11', 'q', 'K']

18, 6267, 843, 25, 9339, 7613, 18, 17, 8131, 1, 3965, 4, 18, 26, 3615, 18, 5691, 5837, 2955, 6, 8, 9589, 9263, 1919, 8561, 3669, 9, 3879, 6955, 7987, 11, 17, 11