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]: ['p', '6123', '6961', 't', 'p', 'h', '9035', 'r', '6341', 'x', '3635', '5885', 't', '3543', '9567', '1787', 'o', '2991', 'k', '3441', '4091', 'a', 'r', '423', '9383', '7147', 'h', '663', 'd']
[A]: a, d, h, k, o, p, r, t, x


[Q]: ['5193', 'h', 'm', '703']
[A]: h, m


[Q]: ['g', '4041', '6277', 'b', '2229', '7325', 'h', 'h', 'c', '8837', '1127', 'h', 'j', '3737', 'a', '5441', '5369', '9567', '6919', '8045', '7773', '6069', '8333', '1427', 's', '1609', 'g', 'o', 'q', '9139', '4691', '5445', 'd', 'n', '2565', 'o', 'r', '8553', '3859', 'c', 'j', 'u', 'g', 'f']
[A]:
a, b, c, d, f, g, h, j, n, o, q, r, s, u