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]: ['7989', '6897', 'o', 'v', '5687', '2933', 'w', '8207', 'y', 's', 'w', '3013', 'h']
[A]: h, o, s, v, w, y


[Q]: ['3651', 'c', 'm', '7123', '2981', '9649', 'o', '2181', 'h', '8577', 'a', '5027', 'x', 'u', '1039', '347', '8219', 'c', '1063', '8885', 'f', 'd', '3067', '2509', 'i', 's', '5509', '2003', 'h', '8869', 'x', 'd', '5141', 'h', 'i', 'b', 'o']
[A]: a, b, c, d, f, h, i, m, o, s, u, x


[Q]: ['3081', 'm', 'w', 'i', '4113', '2021', 'x', 'v', 'w', 'g', '751', '4455', 'a', 'u', 'l']
[A]:
a, g, i, l, m, u, v, w, x