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: ['k', 'n']

A: k, n
****
Q: ['n', 'g', 'u', '2873', 'k', '4411', 'w', '8179', 'w', 'w', 'f', 'g', 'e', '7837', '3055', 'z', 's', '6037', 'n', '1479', 'c', '5311', 'i', 'w', 'z', '1891', '9663', 'y', 'f', 'h']

A: c, e, f, g, h, i, k, n, s, u, w, y, z
****
Q: ['3435', 'e', 'g', 'q', 'm', 'k', '2811', 'z', 'f']

A:
e, f, g, k, m, q, z
****