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: ['f', '71', '5989', '4549', 'F', '1843', '5877', '363', 'x', '5541', '1627', 'x', '1523', 'i', '8439', '9457', '8815', 'I', 'W', '6901', 'k', '1621', 'i', '895', 'l', '5097', 'h', '4959', '8281']

6, 71, 5989, 4549, 6, 1843, 5877, 363, 24, 5541, 1627, 24, 1523, 9, 8439, 9457, 8815, 9, 23, 6901, 11, 1621, 9, 895, 12, 5097, 8, 4959, 8281