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: ['e', '561', 'I', 'm', '1347', '2297', '6319', 'y', '7439']

5, 561, 9, 13, 1347, 2297, 6319, 25, 7439