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]: ['6027', 'v', 'b', 'l', '7853', 'r', 'y', '2919', '3831']
[EX A]: b, l, r, v, y

[EX Q]: ['3651', 'c', 'm', '7123', '2981', '9649', 'o', '2181', 'h', '8577', 'a', '5027', 'x', 'u', '1039', '347', '8219', 'c', '1063', '8885', 'f', 'd', '3067', '2509', 'i', 's', '5509', '2003', 'h', '8869', 'x', 'd', '5141', 'h', 'i', 'b', 'o']
[EX A]: a, b, c, d, f, h, i, m, o, s, u, x

[EX Q]: ['i', 'f', '4417', '6491', '3055', '7201', 'e', 'f', '6069', '7847', '9097', 'n', '5401', '7401', 'q', 'm', '5137', '613', 'w', '1099', 'd', '1821', 'd', 'd', 'q', '3577', 't', 'q', '2261', 'z', 'p', 'j', '4131', 'v', 'p']
[EX A]:
d, e, f, i, j, m, n, p, q, t, v, w, z