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: ['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']

A: b, c, f, g, i, j, o, p, q, y, z
****
Q: ['f', 'j', '9195', '3155', '2855', '5333', '5263', '9279', '687', 'e', '3055', '7233', '13', 'j', 'p', 'i', '8327', 'm', 'h', '3977', 'h', '7997', 'a', 'h', '4661', 'x', '8237', 'a', '5009', 'o', 'p', 'z', '2293', 'q', 'p', '5469', 'k', 'q', 'b', 'n', '1967', '4991']

A: a, b, e, f, h, i, j, k, m, n, o, p, q, x, z
****
Q: ['8731', '705', 'k', 'i', '1063', '8203', 'v', '6175', '9747', '1115', '3727', '2621', 'x', '1647', '2705', 'z', 'a', 'i', 'y', 'e', '433', 'e']

A:
a, e, i, k, v, x, y, z
****