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: ['K', 'C', '1989', 'H', '555', 'm', 'H', '5853', '435', 'M', '2927', '7173', '4213', 'x', 'I', 'Q', '1369', 'Z', '7673', 'M', '2013', 'h', '5375', '6073', '2629', 'h', 'h', 'X', '9699', 'T', 'x', '9317', '3215']

11, 3, 1989, 8, 555, 13, 8, 5853, 435, 13, 2927, 7173, 4213, 24, 9, 17, 1369, 26, 7673, 13, 2013, 8, 5375, 6073, 2629, 8, 8, 24, 9699, 20, 24, 9317, 3215