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.

['j', 'f', '9567', 'f', '7383', 'k', '599', '1091', '1501', 'y', 'o', 'c']
c, f, j, k, o, y

['331', '125', 'u', 'a', 's', '6995', 'i', '3613', '9727', '7087', 'l', 'b', '8291', '813', 'i', '1169', '2159', 'd', '1451', 'q']
a, b, d, i, l, q, s, u

['1175', '8205', '8799', '4295', '2007', '1907', '7473', '6347', 'm', '3229', '2855', '6737', '7061', 'd', '4127', 'q', '3835', 'x', 'l', '1751', '3271', '2497', '8385', 'c', '4041', '5635', 'y', '2655', 'x', '273', '4627', '8579', 'b', '2981', '407', '2313', '4269', '3651', 'j', '3773', '8019']

b, c, d, j, l, m, q, x, y