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: ['W', '2123', '9959', 'y', 'w', '1465', 'n', 's', 'e']

23, 2123, 9959, 25, 23, 1465, 14, 19, 5