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: ['z', '2519', '4799', '4715', '7165', 'r', 'r', 'l', 'n', '6925', '8935', '9795', '5489', 'v', 'u', '6527', '2241', 'u', 'c', 'w', '9755', 'w', '9823', 'g']

A: c, g, l, n, r, u, v, w, z
****
Q: ['7653', 'n', '697', '4565', 't', '7275', '2429', '1365', '7059', 'o', '8053', 'j', '2837', '957', '851', 'z', 'd', 'd', 'y', 'c', '7467', 'o', 'i', '9519', 'q', 'g', '7911', 't', 'g', '3439', '5821', '8433', 'k', 'z', 's', 'g', '685', 'i', 't', 'r', '6881']

A: c, d, g, i, j, k, n, o, q, r, s, t, y, z
****
Q: ['9523', '8791', 's', 'l', 'm', '831', 'y', '203', '3589', 'o', 't', '5025', '2235', '2965', 'h', 'u', 'x', 'h', '3933', 's']

A:
h, l, m, o, s, t, u, x, y
****