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: ['4053', '2031', 'J', 'C', 'h', '9339', 'q', '5773', '7837', 'n', 'h', '341', 'L', '2763', '5135', 'd', '4043', '9187', '8207', '9999', '807']

4053, 2031, 10, 3, 8, 9339, 17, 5773, 7837, 14, 8, 341, 12, 2763, 5135, 4, 4043, 9187, 8207, 9999, 807