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]: ['o', '9599']
[A]: o


[Q]: ['f', 'j', '9195', '3155', '2855', '5333', '5263', '9279', '687', 'e', '3055', '7233', '13', 'j', 'p', 'i', '8327', 'm', 'h', '3977', 'h', '7997', 'a', 'h', '4661', 'x', '8237', 'a', '5009', 'o', 'p', 'z', '2293', 'q', 'p', '5469', 'k', 'q', 'b', 'n', '1967', '4991']
[A]: a, b, e, f, h, i, j, k, m, n, o, p, q, x, z


[Q]: ['a', '7147', '2753', '9335', 'x', 'l', 'a', 'd', '9897', '1777', '6879', '8185', 'k', '2991', 't', 'r', 'i', '7157', '7735', '3269', '3463', '1203', 'y', '6389', 'o', 'd', '6089', 'a', 'y', '7849', '4217', '1833', 'l', '5165', '1985', '3177', '8301', '4787', 'a', 'h', 'h', 'u', '287', 'b', '7919']
[A]:
a, b, d, h, i, k, l, o, r, t, u, x, y