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: ['7301', '7999', 'x', 'r', '6881', 'e', '609', 's', '7495', 'a', 's', '1961', 'q', 'x', '373', '6289', '4847', '5969', 't', '5487', '7639', '9039', '2395', 'b', 'd', '1447', 's', '8137', 's', '443', 'f', 'z', '4823', 'k', 'i', 'o', '4739', 'w', 'f', '8853', 'a']

A: a, b, d, e, f, i, k, o, q, r, s, t, w, x, z
****
Q: ['4945', 'i', 'h', 's', '8925', 'i', '3995', 'f', '813', '1823', '3475', 'q', '2463', '9487', 'c', 'c', 'n', 'y', 's', '6269', 'a', 'u', 'd', 'd', '9291', '3187', '545', '7929', 'd', '1007', '7579', '8421', '4033', 'v', 'c', 'e', 'n', 'j']

A: a, c, d, e, f, h, i, j, n, q, s, u, v, y
****
Q: ['t', '531', 'y', '3401', 'n', 'o', 'u', 'm', '4507', 'u', '737', '4467', 'y', 'e', '3679', 'b', 'k', 'c', '6751', 'b', 'k', '653', 'w', '1211', '9481', 'u', '909', 'j', 'e', 'q', '1605', '6549', 'z', '3425', '5613']

A:
b, c, e, j, k, m, n, o, q, t, u, w, y, z
****