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]: ['o', 'h', 'z', 'n', 'e', 'y', 't', '4371', 'm', '1059', '4853', '8529', 'l']
[EX A]: e, h, l, m, n, o, t, y, z

[EX Q]: ['x', 'i', 'r', '6011', 't', 'f', 'b', 'i', '8367', '4051', '1459', 'f', '5583', '9609', 'l', 'q', 'g', '8443', 'o', '8697', '7053', '8325', 'k', '7021', 'q', 'm', '6899', '9981', '8985', 'i', 'j', '8043', 'k', '535', '7603', '7629', 'k', '2779', 'g', '2049', 'x', 'd', '8527', 'k', 'q']
[EX A]: b, d, f, g, i, j, k, l, m, o, q, r, t, x

[EX Q]: ['2173', '1475', '8625', 'e', '1337', 'c', 'o', 'e', '6217', 'h', '3197', '5927', 'd', '4013', '2439', 'z', '5987', 'k', '1693', 'b', 'm', '2625', '7471', 'x', 'i', 'x', '2179', 'v', '8057', '7129', 'g', 't']
[EX A]:
b, c, d, e, g, h, i, k, m, o, t, v, x, z