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.

['9483', '501', 'j', 'k', '3103']
j, k

['5159', '6407', '4021', '6655', 'c', 'k', 'w', '7191', 'l', '4321', '1609', 'm', '1991', '9261', '511', 'p', '7495', 'b', 'e', '4647', '2711', 'd', 'y', '3835', '5037', '3613', '2695', '3367', 'm', 'j', 'y', '9561', '4889', 'a', 'z', '2253', 'p', 't', 's', '8371', '2859', 's']
a, b, c, d, e, j, k, l, m, p, s, t, w, y, z

['5775', 's', '1547', 'l', 'u', '7', 'e', '5981', 'y', 'm', 'm', 'o', '3323', '7639']

e, l, m, o, s, u, y