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 Input:
['q', '9033', 'p', 'z', '1743', '247', '967', '445', '9849', 'f', '9113', 'b', 'g', '6041', 'j', '927', 'i', 'p', '6821', 'q', '6701', 'f', 'j', 'o', 'y', 'c', '7981', 'b']

Ex Output:
b, c, f, g, i, j, o, p, q, y, z


Ex Input:
['k', 'r', 'f', '4369', 'z', 'z', 'l', '143', 'r', '707', '9167', 'g', '1749', 'i']

Ex Output:
f, g, i, k, l, r, z


Ex Input:
['9395', 's', 'l', 'd', '5003', 'n', 'i', '4395', '4073', 'u', 'u', 'y', '4517', 'f', 'm', 'm', '3335', '2261', '9045', '4633', '4885', 'k', '6943', '2969', '27', '1837', '1031', '9007', 't', '269', 'r', '8691', 's', '4107', 't', '7359', '2869']

Ex Output:

d, f, i, k, l, m, n, r, s, t, u, y