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: ['Z', 'W', 'E', '5559', 'Y', '6769', '1401', 'r', '3107', '1631', 'M', '151', '2757', 'o']

26, 23, 5, 5559, 25, 6769, 1401, 18, 3107, 1631, 13, 151, 2757, 15