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.

['v', '2989', 'z', '7843', 'e', '9923', 'y', 'b', '7611', 'u', 'u', '6227', '3145', 'w', '6451', 'g', '3129', 'o', 'r', 'z', '8349', 'u', 'h', 'd', 'g', 'a']
a, b, d, e, g, h, o, r, u, v, w, y, z

['4269', '1847', '2025', '601', 'g', 'n', 'h', '3499', '4977', '3579', '9355', '3489', 'm', 'm', '4401', '4605', 'l', '3977', 'h', 'd', 't', '5135', '7787', 'k', 'q', '7699', '5325', '6269', '1865', 'h', '8915', '5677', 'g', '603', '1435']
d, g, h, k, l, m, n, q, t

['9203', 'c', '6519', '6823', '9793', '2521', 'g', 'p', '1955', '2771', '9267', '6493', '5699', 's', 'x', 'k', '9325', 'f', '7885', '4051', '8577', 'v', '4763', 'd', '6519', 'r', 'd', 'j', 'z', '1729', '7753']

c, d, f, g, j, k, p, r, s, v, x, z