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]: ['u', 'w', '401', 't', 'g', 'h', 'g', '8073', '9597', '1347', '7835', '5007', '977', 'p', '7679', 'b', '4883', '4931', '999', 'r', '1181', 'x', '2063', 'l', 'w', 'i', 'l', 'x', 'i', '9057', '5007', 'w', '743', '1635', 'y', 'f', '9227', 'z', '5227', 'd', '7129', 'k', '7657']
[EX A]: b, d, f, g, h, i, k, l, p, r, t, u, w, x, y, z

[EX Q]: ['h', 'g', '4563', 'v', 'm', '107']
[EX A]: g, h, m, v

[EX Q]: ['g', 'z', '7761', '6273', 'o', '9445', 'i', '1637', 's', '8481', '2993', 'k', '4619', 'n', 'q', 's', '5321', 'd', '7407', 'k']
[EX A]:
d, g, i, k, n, o, q, s, z