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.

Q: ['r', 'y', 'c', '3211', '9245', '8459', '8521', '5781', 'w', 's', 'd', '5299', 'a', 'y', 'g', 'm', '6435', '8605', 'e', 'h', '6871', 's', '387', 'l', '5829', 'e', 'd', '9545', '2945', 'k', 'v', 't', '8449', '2199', 'm', '2599', '1489', '6623', 'x', 'l']

A: a, c, d, e, g, h, k, l, m, r, s, t, v, w, x, y
****
Q: ['s', '6723', 'l', '1573', '1129', 'n', '4277', '5003', 'y', '7563', 'c', '6747', '3105', 's', '3593', '8417', '8253', '4157', 'w', 'f', 'z', 'd', '9685', '1033', 'h', '4893', 't', 'j', '6821', 'z', 'a', 'u', '591', 'o', '1087', '2147', '1223', '2339', 'i', 'y', '9307', 'x', 'z', 'r', 'y']

A: a, c, d, f, h, i, j, l, n, o, r, s, t, u, w, x, y, z
****
Q: ['k', '989', '9423', '2099', '5607', '2363', '3055', '1663', 'k', '5951', '7979', '5163', '5183', 's', 't', 'p', 'n', 'j', 'k', 'k', 'u', 'm', '2709', '7949', '5301', '8509', '8235', 'i', '3617', 'i', '5559', '3781', '9385', 'g', 'f', '8683', '4229', '8699', '9579', 'n', '4279', '3815']

A:
f, g, i, j, k, m, n, p, s, t, u
****