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]: ['k', 'j', 'v', '5277', '8607', 'n', '1109', 'e', 'k', '6579', 'o', '2909', 'u', 't', '9685', '8443', '9257', '8071', 'y', 'b', 'h', '4767', 'a', 'j', '8455', 'b', '7733', '2553', 'e']
[A]: a, b, e, h, j, k, n, o, t, u, v, y


[Q]: ['789', '3603', '3517', '5831', 'z', 'q', 'w', 'l', '5701', '9503', '8169', '1123', 'e', '529', 'j', 'z', 'l', 'o', '3705', 'o', '5131', '6063', 'c', 'j', '6275', '7701']
[A]: c, e, j, l, o, q, w, z


[Q]: ['v', 'u', 'q', '9803', 'x', '9535', 'a', '9987', 'p', 'l', 'h', '8285', 'i', '3457', 'r', 's', '7925', 'g', 'f', '8163', 'h', 'x', 'm', 'j', '3257', '1203', '5653', '6811', '8925', '1239', '5921', '7341', '2079', '7539', 'i', 'c', '5329', 'c', '1857']
[A]:
a, c, f, g, h, i, j, l, m, p, q, r, s, u, v, x