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: ['1223', 'h', 'a', 'o', 'v', '2535', 'g', '6267', 'w', '9625', '7961', '9577', '7611', '5655', 'p', 'j', 's', '2141', '4101', 'l', '4367', '9383', 'n', '5965', '9097', '7571', 'p', 'u', 'x']

A: a, g, h, j, l, n, o, p, s, u, v, w, x
****
Q: ['p', 'f', 'h', '1977', '6221', 'i', 'a', 'l', '5225', '8059', 'c', 'w']

A: a, c, f, h, i, l, p, w
****
Q: ['4275', 'k', '4693', '7305', '5549', '7159', 'h', 'n', 't', 'i', 's', '1079', '1505', '355', '5167', 'n', 't', '9275', '619', '5053', 'u', 'i', 's', 'b', '9205']

A:
b, h, i, k, n, s, t, u
****