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]: ['395', '8309', 'v', 'r', 'x', 'j', 'l', 'b', 'c', 'c', '3123', 't', 'a']
[EX A]: a, b, c, j, l, r, t, v, x

[EX Q]: ['8357', 'x', 'w', '287', 'z', '2733', '1757', 'w', 'g', '1393', '7201', '4931', 'k', '5185', 'x', '6313', '2255', 'z', 'v', '3593', '6191', '4423', 'm', 'k', '3209', '3559', 'c', 'n', 'm', '5461', '2997', '235', '4045', '6597', 'v', 'e', 'p', 'c', 'k', 'd', '5529', '6241', 'u', 'f', '8067']
[EX A]: c, d, e, f, g, k, m, n, p, u, v, w, x, z

[EX Q]: ['6629', 'd', '1493', 'r', '663', '3449', 'i', '3997', '229', 'f', 't', 'k', 'f', '3631', '9755', 'l', '9117', 'x', '6921', 'u', 'g', 'f', 'c', '9719', '1669', '4517', '77', '1903', 'a', '2927', 'j']
[EX A]:
a, c, d, f, g, i, j, k, l, r, t, u, x