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]: ['e', '2239', 'l', '8309', 'i', '2613', 'i', '611', '6481', 'j', 'v', '1867', '415', '269', '8053', '3369', 'q', 't', '2303', '7729', '1059', '6135', '3299', 'd', '6855', '207', '6227', '7859']
[EX A]: d, e, i, j, l, q, t, v

[EX Q]: ['k', '6595', '1595', 'v', 'h', 'b', '8815', '6681', 'j', '7581', 'p', '9095', '5453', 'r', 'y', '7755', 'x', '1853', 'k', 'q', 'u', 'j', 'q', '9651', 'o']
[EX A]: b, h, j, k, o, p, q, r, u, v, x, y

[EX Q]: ['a', 'q', 'i', '1877', '4817', '6047', 'y', '6865', 'q', 'y', 'z', 'e', 'a', 'u', '4543', 'g', 'j', 'l', 'k', 'o', '9677', '8835', '2981', '7821', '7475', 'n', '2941', '6303', 'o', 'w', 'b', 'y', '2369']
[EX A]:
a, b, e, g, i, j, k, l, n, o, q, u, w, y, z