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: ['u', 'o', 'b', 'b', '5873', 'w', 'v', '4171', '7957', '3501', '2563', 'l', 'q']

A: b, l, o, q, u, v, w
****
Q: ['5611', 'x', 't', 'p', '5711', '7079', '5251', '429', 'z', 'u', '8721', '9321', '79', 'i', '189', '3605', 'k', '445', 'r', 'k', 'o', '2189', '8521', '8849', '2651', 'm', '4149', '1577', '3085', '5275', '6413', '5265', '6089', 'r', 'f', '5013']

A: f, i, k, m, o, p, r, t, u, x, z
****
Q: ['e', 'v', 'u', 'v', 'f', '1999', 'z', '8967', '3421', 'v', 'z', '5063', 'w', 'a', '6587', 'r', 'u', '719', 'w', 'w', '1031', 's']

A:
a, e, f, r, s, u, v, w, z
****