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: ['x', '5205', '103', '1305', 'P', '8591', 'T', '6709', '95', '359', 'F', '2159', '2131', '9547', 'N', '2185', '1491', 'X', '4781', 'R', 'p']

24, 5205, 103, 1305, 16, 8591, 20, 6709, 95, 359, 6, 2159, 2131, 9547, 14, 2185, 1491, 24, 4781, 18, 16