Given the task definition and input, reply with output. In this task, you are given an input list A comprising of numbers and alphabets. You need to extract and sort the unique alphabets in the list. The alphabets in the input list will only be in lowercase. Return -1 if there is no alphabet in the input list.

['5743', '7295', '3247', 'v', '2929', '1811', '7423', '963', 'z', 'j']

j, v, z