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]: ['i', '4447', 'g', 'o', 'j', 'p', 'l', 'q', 'o', '8777', 'r', 'v', '961', '6083']
[A]: g, i, j, l, o, p, q, r, v


[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]: ['9717', 'k', 'y', 'j', 'e', '147', '2659', 'i', 'b', '6321', '7199', '307', '8989', '8515', 'g', 'v', 'r', '6929', 's', 'd', '6505', 'h', '5677', 't', 'u', '8287', '6127', '3213', 'r', '9407', 'd', 'j', 'e', '1485', 'n', '2201', '9121', 'q', '5765']
[A]:
b, d, e, g, h, i, j, k, n, q, r, s, t, u, v, y