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.

['u', '635', '5249', '9457', 's', '9317', '9407', 'l', 'w', '9705', 'k', '429', '5489', 'e', 'd', '2457', 'o', '4665', '1675', 'l', 'y', 's', 'o', 't', '4285']
d, e, k, l, o, s, t, u, w, y

['z', 'm', 'n', 'u', '9159', '7931', '5401', '1383', '8195', 't', 'x', 'q', 'r', '2535', 's', 'j', 'c', '8123', '2429', '5581', 'k', 'c', 't', 'i', 'm', 'o', 't', 'q', '4819', 't', '1649', 'r', 'y', 'z', '8813', '7451', '199', 'o', 'x', 's', 's', '6747']
c, i, j, k, m, n, o, q, r, s, t, u, x, y, z

['c', '5745', '1425', '3145', 'd', '4005', 'z', '2211', 'e', 'q', '1849', 't', 'o', '7473', 'h', 'i', 'h', '715', '7927', '3361', 'r', 'b', '9383', 'e', 'a', '7427', 'n', 'q', '2837', '9935', '7629', '3641']

a, b, c, d, e, h, i, n, o, q, r, t, z