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', '9509', '817', '747', '8065', 'C', '7481', 'w', '5085', '1945', 'V', '503', '1293', 'n', 'a', 'f', '2833', '4453', 'z', 'Z']

12, 9509, 817, 747, 8065, 3, 7481, 23, 5085, 1945, 22, 503, 1293, 14, 1, 6, 2833, 4453, 26, 26