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.

[EX Q]: ['2459', '3709', 'f', '8673', '9313', 'm', 'd', 'g', 'c', 'g', 'u', 'f', 'p', 'i', '8771', '3613', '9669', '6221', '1211', '8331', '2295', 'b', 'f', 'm', '1377', '9831', '1751', 'k', '4831', 'm', '2747', '3435', '4543', 'c', '1729', 'e', '7093', '397', 'm', '383', '2019']
[EX A]: b, c, d, e, f, g, i, k, m, p, u

[EX Q]: ['2165', 'f', '5081', 's']
[EX A]: f, s

[EX Q]: ['4737', 'u', 'r', 'i', '6069', '7501', '5007', '8417', 'r', '1397', '9861', 'a', 'b', 'z', 'n', 'u', '2455', 'z', 'z', 'h', 'g', '1661', '279', '9109', '5549', 'j']
[EX A]:
a, b, g, h, i, j, n, r, u, z