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: ['3043', 'r', 'm', 'i', '2653', 'i', '1703', '1125', '6299', '4863', 'n', 'h']

A: h, i, m, n, r
****
Q: ['51', '9599', '6307', 'n', '7245', 'b', 'i', '797', 'v', '6781', 't', '7007', '5993', '1191', '8023', '9199', '3423', '9581', 'x', '8895', '3459', 'a', '3649', 'u', 'p', 'y', '9701', '6419', '8555', 'v', 'u']

A:
a, b, i, n, p, t, u, v, x, y
****