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]: ['y', 'u', 'c', '5909', 'x', '9865', 'e', 'h', '5125', '4719', 'w', '8855', 'i', 'd']
[EX A]: c, d, e, h, i, u, w, x, y

[EX Q]: ['s', 'w', 'c', '4137', 't', '2437', '349', 'h', '4539', 't', 'b', 'y', 'q', 't', '9087', 'c', '9489', '6285', '6247', '8353', 'n', 't', '8661', 'p', 'z', 'p', '773', 'w', 'q', '8081', 'r', 'u', 'z', 'k', 'a', 'b', '7513', '5549', '5325', '1101', 's', '6507', '3317']
[EX A]: a, b, c, h, k, n, p, q, r, s, t, u, w, y, z

[EX Q]: ['5059', '9737', 'f', '9259', 'j', '587', '6937', 'e', '4893', 'y', 'i', '8175', '883', 's', '5181', 'w', '1705', 'g', '3161', 'i', 'i', 'u', '7927', 'w', '833', '5279', '8747', 'u', 'c', '3621', 'u', 'o', '5931', '2371', '6059', '6709', '3387', 'j', 'n', '9975', '1601', 'm']
[EX A]:
c, e, f, g, i, j, m, n, o, s, u, w, y