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: ['5561', 'x', 'V', 'K', 'N', '4809', 'u', '4005', 'r', 'J', 'f', '8059', 'K', 'b', 'Y', '4489', '9271', 'K', '3339', '2219', 'Y', 'K', 'Y', 'R', 'a', 'l', '6921', 'f', '4315', '5193', 'z', 'a']

5561, 24, 22, 11, 14, 4809, 21, 4005, 18, 10, 6, 8059, 11, 2, 25, 4489, 9271, 11, 3339, 2219, 25, 11, 25, 18, 1, 12, 6921, 6, 4315, 5193, 26, 1