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]: ['1649', 'l', 'i', '5901', 'o', 'g', '1197', 'a', '9327', '9835', '1095', 'k', '4489', '9149', 'o', '3095', 'z', 'u', 'y', '561', '7419', 't', 'j', '8763', 'v', '339', 'y', 'w', 'v', 'v', '1867', 'd', 'r', 'w', 'h', 'j', '1531', '3841']
[A]: a, d, g, h, i, j, k, l, o, r, t, u, v, w, y, z


[Q]: ['2995', '8179', '8131', '5655', 'j', 'q', 'l', '3193', '1823', 'y', 'n', '7645', 's', '5665', 'r']
[A]: j, l, n, q, r, s, y


[Q]: ['a', '337', '1863', 'v', 'w', 'j', '819', 'i', '6397', 'v', '6285', '4969', '4563', 'y', '2457', '3135', 'v', '3757']
[A]:
a, i, j, v, w, y