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]: ['f', '9203', 'w', 'f', '3751', '8095', '1319', 'f', '3017', 'r', 'y', '8221', '2715', '9959']
[A]: f, r, w, y


[Q]: ['r', 's', '3409', 'a', 'e', '6855', 'i', 'n', '8655', 's', 't', '8401', 'u', '9603', '8815', 'q', 'a', 'x', 'i', '8455', 'e', '5877', '3917', 'p']
[A]: a, e, i, n, p, q, r, s, t, u, x


[Q]: ['3317', '7653', '5731', 'w', 'f', '2911', '3783', '4497', '9597', '6309', 'v', 'p', 'v', 'i', 'a']
[A]:
a, f, i, p, v, w