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]: ['565', 'i', '615', '3047', 'm', '195', '7547', '3003', '9213', '9063', 'c', '5099', 'v', '5003', '9053']
[A]: c, i, m, v


[Q]: ['9627', '9879', '5421', '4755', '1533', '6727', 't', '7641', 'd', '3929', 'h', '3989', '8441', 'k', 'p', '2653', 'm', 'b', 'i', '3431', '4907', '5687', 'g', 'h', '9185', '5051', 'k', '7135', '709']
[A]: b, d, g, h, i, k, m, p, t


[Q]: ['2865', '7943', 'l', 'j', 'a', '3501', 'e', '7043', 'l', 'g', 'w', 'a', '5243', '685', 'l', 'n', 'q', '6037', 'm', 'a', 'l', 'q', '4267', '6345', '8349', 'z', 'x', 'b', 'i', 'd', 'p', '1091', 'o', 'v', '4139', '497', 'h', 'r', 'k', 'o', 'o', 'v']
[A]:
a, b, d, e, g, h, i, j, k, l, m, n, o, p, q, r, v, w, x, z