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', '7757', '2023', 'x', '4111', '2357', '6703', '2211', '7021', 'I', 'J', 'J', '2381', 'R', '4037', 'c', 'i', 'U', 'k', '1441', '7747', '8079', '1563', '3837', 'L', '1333', '1367', '6167', '3653', '3009', '5345', '3131', 'l', '705', 'k', 'I', '7879']

18, 7757, 2023, 24, 4111, 2357, 6703, 2211, 7021, 9, 10, 10, 2381, 18, 4037, 3, 9, 21, 11, 1441, 7747, 8079, 1563, 3837, 12, 1333, 1367, 6167, 3653, 3009, 5345, 3131, 12, 705, 11, 9, 7879