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: ['1931', 'c', 's', '8767', 'z', '8977', '9249', '365', 'p', '7187', 'p', '961', 'k', 'k', '423', '5999', '4697', '6251', '6441', '1821', 's', 's', 'f', '5365', 'z', '5113', 'y', 'k', 'i', '5627', 'u', 'w', '4103', '8035', '7105', 'o', 'n', 's', 'y']

A: c, f, i, k, n, o, p, s, u, w, y, z
****
Q: ['4787', 'c', '1727', '9863', '8147', '3931', 'b', '1133', '3023', '7427', '7837', 'n', '7921', 'o', 'c', '3973', '1949', 'x', 'g', 'b', 'd', '8559', '8661', '4465', 'z', '369', 'q', 'e', 'y', '8629', '7665', 'i', 'r', 'n', 'z', '9115', '1393', '4899']

A: b, c, d, e, g, i, n, o, q, r, x, y, z
****
Q: ['4813', '2033', 'm', 'v', '7409', '9733', 'z', '4711', 'c', '2853', 'z', 'f', '8991', 'v', '5813', 'n', 'e', 'i', '5005', '4063', 'r', '7401', 'n', '475', '453', 'd', '1667', '1489', 'f', '8727', 'd', 'd', '4535', 'k', 'y', '1893', '5665', 'o', '5805', '8911', '1183', 'r', 'r', '7103']

A:
c, d, e, f, i, k, m, n, o, r, v, y, z
****