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]: ['2161', '8009', '3057', 'r', '3897', 'd', 'j', '2727', 'b', '3231', 'i', '9227', '393', '5799']
[A]: b, d, i, j, r


[Q]: ['d', 'p', 'q', '5319', 'w', '4887', '6695', 't', '7711', 'l', '7597', 's', 'n', '1461', 'e', '9045', '1307', 'j']
[A]: d, e, j, l, n, p, q, s, t, w


[Q]: ['8591', '5011', '2171', 'y', '9855', '971', 'm', 'c', '8331', '3845', '8481', '3501', 'g', '6441', 'q', 'a', '9083', 'k', 'v', 'h', '8799', 'i', 'd', '4473', '153', '6723', 'x', 'e', '8975', '107', 'b', '9075', 'o', 'b', 'd', '7149', '2037', '8915', '1023', 'm', 't']
[A]:
a, b, c, d, e, g, h, i, k, m, o, q, t, v, x, y