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: ['i', '4455', 'L', 'G', 'F', 'J', '1491', '2563', '969', '5487', '7267', '8643', '4253', 'h', 'p', '765', 'q', 'c', 'X', 'N', 'K', 's', '4201', 'q', '6975', 'u', '9703']

9, 4455, 12, 7, 6, 10, 1491, 2563, 969, 5487, 7267, 8643, 4253, 8, 16, 765, 17, 3, 24, 14, 11, 19, 4201, 17, 6975, 21, 9703