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]: ['4423', '8295', 'h', '4881', 'j', 'c', '1185', 'z', 'm', '2725', 'p', '9187', '6275', '1617', '2523', '9879', '4149', '2197', '3909', '5155', '691', 'r', 'e', 'u', 'l', 'd', '1581', '2763', 'c']
[A]: c, d, e, h, j, l, m, p, r, u, z


[Q]: ['c', 'e', '6509', '1295', 'u', '5445', '1731', '3049']
[A]: c, e, u


[Q]: ['6905', 'n', '3329', 'h', '1681', 'c', 'y', '1781', 'u', 'v', 'y', 'h', '5709', '5037', '3733', 'z', '3259', 'e', '5377', 'c', '9481', 'g', '4963', '8171', '3585', '6657', '1901', 'l', '2075', '7135', '4235', '1437', '5341', '2281', 'p', '4649', '6931', '1779', '4875']
[A]:
c, e, g, h, l, n, p, u, v, y, z