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]: ['g', 'h', 'g', 'g', 's', 'h', '2849', '2705', '1185', 'x', '5789', '8221', 'e', 'x', 'g', 'b', '4903', 'q', '1563', 'r', 'k', 't', '9047', 'p', 'p', '9397', 'u', '7473', 'f', 'o', 'y', '1957', '1039', '9905', 'i', '4829', 'q', 'w', 'k', 'p', 't', '563', 'g', 'l']
[A]: b, e, f, g, h, i, k, l, o, p, q, r, s, t, u, w, x, y


[Q]: ['7965', '6465', 'c', '7963', 'j', '6839', '9989', '1019', 'x', '1303', '2633', 'y', '6865', 'a', 'k', '635', '3719', '7229', 'k', 't', 'r', '5741', '9569', '4931', '1125', 'f', '5429', 'c', '2065', '6315', 'e', '6877', '2005', 'x', '7831', '7297', 'm', '3571', 'b', '8617', '2981', 'i', '5105', 'g', 'u']
[A]: a, b, c, e, f, g, i, j, k, m, r, t, u, x, y


[Q]: ['1039', '8413', '3391', 's', 'p', 'r', '5261', '9601', '9213', 'o', 'o', 'm', 'g', 'd', '7125', 'z', '767', '7377', 's', 'c', '1471', 'b', 'f', '2917', '4261', 'h', '7499', '2109', 'z', 's', '4611', '7265', 'k', 'n', 'j', 'v', '6101', '2703', '6045', 's', '839', 'a', '2085', 's', 'p']
[A]:
a, b, c, d, f, g, h, j, k, m, n, o, p, r, s, v, z