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: ['J', 'Y', '1305', 'n', 'J', '4533', 'r', '6587', 'Y', '8961', 'a', 'Z']

10, 25, 1305, 14, 10, 4533, 18, 6587, 25, 8961, 1, 26