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]: ['b', 't', '2199', 'e', 'i', '1883', '5137', '8495', 't', '7377', 'm', '7665', '2009', 'o', '3757', 'm', '861', 'm', 'l', '9229', 'c', 'r', 'q', 'i', 'm', '705', 'b', '4301', 'd', 'l', 'f', '5485', 'h', 'p', '4529', '7879', 'f', 'b', 'm']
[A]: b, c, d, e, f, h, i, l, m, o, p, q, r, t


[Q]: ['8829', 'm', '5369', 'q', '5737', '7799', '5705', 'p', 'w', '1983', '4849', 'h', '6771', 'p', 'y', '1071', 'u', '6401', '7723', 'p']
[A]: h, m, p, q, u, w, y


[Q]: ['7233', 'a', '9867', 'c', 'u', '2339', '2211', '1373', '9693', 'i', 'x', 'v', '4767', 'w', 'z', 'h', '9175', '5565', 'b', 'f', '8667', '3919', '4785', 'l', '3449', '1909']
[A]:
a, b, c, f, h, i, l, u, v, w, x, z