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]: ['4925', '9943', '7935', '4387', '2449', '5797', 'i', '1517', 'w', 'e', '9525', 'y', 't', 'e', '2793', 'v', '9897', '8709', '7247', 'o', 'f', '5549', 'q']
[EX A]: e, f, i, o, q, t, v, w, y

[EX Q]: ['f', 'a', 'r', '4009', 'k', 'a', 'g', '7725', 'v', 'b', '6705', 'a', '6583', '3159', 'c', 'w', 'x', 'h', '7625', 'p', 'y', '5645', 'k', 'r', 'j', '4175', 'r', '3103', '8631', '5999', 'p', 'g', 'h']
[EX A]: a, b, c, f, g, h, j, k, p, r, v, w, x, y

[EX Q]: ['6653', '417', '9109', '4263', 'v', 'x', 'm', '6011', '1603', '3629', '1481', 'z', '1025', '1545', 'r', 'i', '9665', 'l', '1195', '7021', '7901', '1997', 'y', 'v', 'd', '9729', '6593', '1855', 's', 'h', '8025', '239', '7863', '4149', '1363', '4881', '3445', 'g', 'r', '443', 'e', '3373', '4627']
[EX A]:
d, e, g, h, i, l, m, r, s, v, x, y, z