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', '8407', 'y', 'h', '1377', '3511', '1449', 'z', '3991', 'n', 'x', 't', 'h', '6389', '8049', '6091', '7787', 'p', 'l', '5815', 'k', 'e', 's', 'a', '9491', 'w', '1909', '4801', '4725', 'i']

A: a, e, h, i, k, l, n, p, s, t, w, x, y, z
****
Q: ['q', 'g', 's', 'g', 'z', '987', '777']

A: g, q, s, z
****
Q: ['8907', 'b', 't', 'v', '5349', '8917', '2013', '1011', '907', 'q', 's', '1535', '5071', '7421', 'g', '4089', 'p', '3039', 'l', 'n', '4343', 'a', '3059', 'e', '3557', 'w', '1585', '8957', 'm', '3843', '1449', '2309', 'x', '5453', 'm', 's', 'x']

A:
a, b, e, g, l, m, n, p, q, s, t, v, w, x
****