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: ['a', 'i', '7725', '2483', 'e', 'j', '5337', 'b', '6835', '8231', 'm', 'v', 'a', '1475', 'n', '5823', 's', 'm', '7313', '2841', '2585', '4673', 'u', '2083', 'z', 'd', 'p', '2117', 'i', '587', 'i', 'a', '2527', '7967', '6567', 'n', '6145', 'r', 'f']

A: a, b, d, e, f, i, j, m, n, p, r, s, u, v, z
****
Q: ['7123', 'm', 'h', '4065', 'c', 'n', '187', '3899', 'r', 'k', '2071', '9481', '6277']

A: c, h, k, m, n, r
****
Q: ['m', '2907', '6467', 'h', 'y', '8043', '7477', '7459', '6287', '8575', 'o', 'k', 'f', 'k', 'p', '513', '365', '1729', 'r', '1749', '2149', 'r', 'm', '2955', '5971', 's', '7141', 'j', '1313', '7235']

A:
f, h, j, k, m, o, p, r, s, y
****