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]: ['7123', 'm', 'h', '4065', 'c', 'n', '187', '3899', 'r', 'k', '2071', '9481', '6277']
[EX A]: c, h, k, m, n, r

[EX Q]: ['w', 'a', 'm', 'd', '409', 'm', 'v', 's', '7801', 'l', '8551', 'k', '867', 'n', '7731', 'z', '3773', '9137', 'v', 's', 'p', 'p', 'f', 'z', 'g', 'q', 'g', '877', '697', '2057', '8389', '2399', '5263', '2761', '9841', '1781', 'l', '8023']
[EX A]: a, d, f, g, k, l, m, n, p, q, s, v, w, z

[EX Q]: ['8597', '1627', 's', 'y', '2249', '59', '9599', '245', 'p', 'u', '5773', '6101', 'g', 'h', '5175', 'r', 'l', 'u', '9577', 'b', 'c', '9185', 't', '2771', '9089', '7139', '5245', 'c', '6761', '305', 'f', 'x', '1915', '2169', 'i', 'v', '9883', '4963', '6077', '627', 'p']
[EX A]:
b, c, f, g, h, i, l, p, r, s, t, u, v, x, y