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.

[Q]: ['k', 'v', 'e', '6377', 'y', '3585', '4535', 'f', 'g', 'm', 'f', '8369', 'v', '7445', '4527', '9383', 'n']
[A]: e, f, g, k, m, n, v, y


[Q]: ['459', '1729', 'b', 'c', '9619', '4461', '4347', '6733', 'i', '3631', 's', 'j', 'i', 'r', '5293', 'q', '7397', '4309', 'c', 'n', 'k', '197', 'q', '8139']
[A]: b, c, i, j, k, n, q, r, s


[Q]: ['849', '2665', '481', 'r', 'b', 's', '8733', '1325', '3699', '4335', 'b', 'd', 'z', 'v', 'e', 'd', '6371', 'z', 'v', 'f', '5995', '6813', '1023', 't', '9153', '5927', 'h', '5593', 'l', 's', '9875', '501', '1177', '8183', 'f', 'p']
[A]:
b, d, e, f, h, l, p, r, s, t, v, z