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: ['l', '7123', '5711', '1595', 'J', '2149', 'D', 'A', 'x', '1669', 'L', '1413', 'y', '9859', 'Z', '4031', '7479', '5609', 'v', 'd', 'Z']

12, 7123, 5711, 1595, 10, 2149, 4, 1, 24, 1669, 12, 1413, 25, 9859, 26, 4031, 7479, 5609, 22, 4, 26