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: ['G', 'Y', 'Y', '3859', '9237', 'u', '7997', '5997', 'c', 'J', 'z', '8359', 'z', '8053', '907', 'H', 'j', '5001', 'V', 'q', '1191', 'I', 'R', 's', '3317', '4833', 'm', '5109', 'Y', '7773', '9327', 'V', 'D', '7959', 'U', 'f', '2863', '9599']

7, 25, 25, 3859, 9237, 21, 7997, 5997, 3, 10, 26, 8359, 26, 8053, 907, 8, 10, 5001, 22, 17, 1191, 9, 18, 19, 3317, 4833, 13, 5109, 25, 7773, 9327, 22, 4, 7959, 21, 6, 2863, 9599