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]: ['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']
[A]: b, c, d, e, f, g, i, k, m, p, u


[Q]: ['o', 'm', '8015', '787', '4787', '1727', 'f', 'e', 'c']
[A]: c, e, f, m, o


[Q]: ['f', '7247', '4605', 'l', 't', '9669', '2589', 'x', '4783', 'v', '4425', 't']
[A]:
f, l, t, v, x