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: ['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: ['8495', 'p', 'j', 'm', 'n', '9115', '1183', 'r', 'r', '8735', 'a', 'i', 'k', 'p', '8927', 'r', '9283', '9563', 'g', '2503', 'h', '1091', '5257', 'a', '3061', '2835', 'l', 'w', 'j', '7617', '8793', '7463', 'h', '8467', '7337', 'b', '4655', 'd']

A: a, b, d, g, h, i, j, k, l, m, n, p, r, w
****
Q: ['c', 'a', 'u', '6511', 'y', 'i', '3795', 'y', '4953', 'h', 'y', '6461', '1197', 'j', 'n', '3819', 'q', 'g', 'w', 'e', 'k', '1013', 'a', 'k', 'n', 'i', 'x', '5473', 'v', '2213', '5393', 'd', 'j', '7729', '511', '2065', 'f', 'a', '189']

A:
a, c, d, e, f, g, h, i, j, k, n, q, u, v, w, x, y
****