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]: ['4009', 'y', '9077', 'p', 'q', '6711', '6443', '5491']
[A]: p, q, y


[Q]: ['o', '4169', 'k', '7349', 'w', 't', '8271', '8781', '3725', '2865', '6053', 'j', 'z', '4211', '8231', '213', '6389', 'f', 'h', 'g', '9269', '4617', '4137', 'i', 'y', 'i', 'n', '4597', 'p', 'z', '3195', '3231', 'c', '1901', '1231', 'p', '4509', '2557', '3715']
[A]: c, f, g, h, i, j, k, n, o, p, t, w, y, z


[Q]: ['p', 'j', '5667', '3349', '7349', 'v', '8713', '137', '5569', 'i', 'm', 'o', '4799', 'm', 'p', 'q', '5329', 'v', '2463', '2781', 'w', '3389', '1637', 'h', '473', '207', '6303', '1347', 'g', '1617', 'u', '961', '1981', '2861', 'h', '7661', 'i', 'c', '3155', 'l', 'u', 'b', 'r']
[A]:
b, c, g, h, i, j, l, m, o, p, q, r, u, v, w