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', 'a', 'b']
[A]: a, b


[Q]: ['3117', 'i', 'd', '7537', 'i', 'q', '4649', '7263', '3655', 'd', 'x', '8569', 'g', '2389', '3933', '7099', '563', '3055', '9941', 'm', 'c', '3529', '3577', 'x', 's', 's', '6153', '1731', '9679', 'f', '8839', '5183', '5', '6433']
[A]: c, d, f, g, i, m, q, s, x


[Q]: ['n', '7959', '7961', 'q', '6157', 'v', 'h', 'm', '8587', '1539', 'k', '8727', 'p', 'v', 'x', '7369', '1487', '8437', '2005', '4233', 'w', 'p', '1307', '9367', '757', '8103', '3163', 'h', 'h', 'j', 'x', 'h', '3189', '6699', '3501', 'n', '5907', '2813', 'b', '5389', 'd', 'm', '5823', 'z', '9437']
[A]:
b, d, h, j, k, m, n, p, q, v, w, x, z