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]: ['c', '1693', 'l', 'u', 'x', '3609', 'h', '4159']
[A]: c, h, l, u, x


[Q]: ['f', '9203', 'w', 'f', '3751', '8095', '1319', 'f', '3017', 'r', 'y', '8221', '2715', '9959']
[A]: f, r, w, y


[Q]: ['8633', '6671', '7979', 'u', 'd', '8965', 'z', '4845', 'm', 'h', 'p', '3269', '2289', 'z', '5279', 'i', '9581', '681', '3241']
[A]:
d, h, i, m, p, u, z