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]: ['6249', '1235']
[A]: -1


[Q]: ['v', '5433', 'v', '6749', '7491', 'i', 'm', 'e', '5815', '8423', '833', '7359', 'm', 'i', 'f', 'u', 'p', 'j', 't', '3171', '6165', 'q', 'a', '9475', 'm', 'q', '5995', '8443']
[A]: a, e, f, i, j, m, p, q, t, u, v


[Q]: ['m', 'u', '2421', 'h', '6599', 'f', '8833', '9349', 'p', 'v', '8111', '161', 'm', '1041', 'j', '2323', 'g', '1665', 'f', 'i', '5317']
[A]:
f, g, h, i, j, m, p, u, v