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: ['o', '4169', 'k', '7349', 'w', 't', '8271', '8781', '3725', '2865', '6053', 'j', 'z', '4211', '8231', '213', '6389', 'f', 'h', 'g', '9269', '4617', '4137', 'i', 'y', 'i', 'n', '4597', 'p', 'z', '3195', '3231', 'c', '1901', '1231', 'p', '4509', '2557', '3715']

A: c, f, g, h, i, j, k, n, o, p, t, w, y, z
****
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: ['3525', 'n', 'g', '5237', '6661', 'd', 'v', '7807', 'j', '6473', '4367', 't', 'm', 'u', 'l', '4057', 'm', 't', '6823']

A:
d, g, j, l, m, n, t, u, v
****