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.

[EX 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']
[EX A]: c, f, g, h, i, j, k, n, o, p, t, w, y, z

[EX Q]: ['5785', 'c', 'f', '7087', 'd', '9225', 'm', 'g', '4639', '7165', '3445', '3813', 'p', 'i', '719', 's', 'g', '6423', '9563', 'w', 'm', '8659', '8809', '4105', '3923', '465', '5637', '5547', 'h', 'v', '9453', '4009']
[EX A]: c, d, f, g, h, i, m, p, s, v, w

[EX Q]: ['u', 's', '7575', 'c', '2341', '1891', '3375', 'w', '1185', '139', '6223', '1115', '1641', '8101', 'q', 'z', 'd', '147', '1727', '9611', '6229', '2467', '4205']
[EX A]:
c, d, q, s, u, w, z