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: ['7015', 'f', '3605', '3883', '2335', 'Y', '2009', '4203', '7917', '3931', '2925', 'n', 'd', '9391', 'a', 'J', 'A', 'C', '6481', 'n', '3383', '3503', '9245', 'G', 'v', '8877', '2007', 'M', 'U', '5963', 'k', '2375', 'S', 'I', '7773', '1281', '5173', 'z', '5365']

7015, 6, 3605, 3883, 2335, 25, 2009, 4203, 7917, 3931, 2925, 14, 4, 9391, 1, 10, 1, 3, 6481, 14, 3383, 3503, 9245, 7, 22, 8877, 2007, 13, 21, 5963, 11, 2375, 19, 9, 7773, 1281, 5173, 26, 5365