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]: ['8357', 'x', 'w', '287', 'z', '2733', '1757', 'w', 'g', '1393', '7201', '4931', 'k', '5185', 'x', '6313', '2255', 'z', 'v', '3593', '6191', '4423', 'm', 'k', '3209', '3559', 'c', 'n', 'm', '5461', '2997', '235', '4045', '6597', 'v', 'e', 'p', 'c', 'k', 'd', '5529', '6241', 'u', 'f', '8067']
[A]: c, d, e, f, g, k, m, n, p, u, v, w, x, z


[Q]: ['5973', 'h', '4081', 'i', '8059', 'w', 'j', '6175', 'w', '8685', '5811', 'k', 'n', '5577', '9817', 'v', '8617', 'u', 'y', '3921', 'b', '1027', '5405', 'a', '3501', '6659', 's', 'e', '157']
[A]: a, b, e, h, i, j, k, n, s, u, v, w, y


[Q]: ['k', 'b', '75', 'a', '5073', 'n', 'p', 'f', '1031', '1649', 'y', '6067', '6013', '1181', 'h', 'n', 'e', '5923', 'q', '2423', '6237', '3819', '4425', 'f', 'y', '8903', '8651', '3965', 'm', 'x', 'd', '199', '2631', '6535', '9803', '701', '6549', '5901']
[A]:
a, b, d, e, f, h, k, m, n, p, q, x, y