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: ['575', 'u', 'c', '8113', '2853', '3661', '9427', '3071', '4069', '835', 'w', 't', 'w', 't', 'v', 'g', 'c', '5497', '1703', '8433', 'g', '3545', '2887', 'z', 'a', '2241', '5799', '5915', 'u', '4015', '8327', 'z', 'a', 'w', '8311', '289', '8575', 't', 'b', '2873', 'r', 'z', 'x', '1165', '9881']

A: a, b, c, g, r, t, u, v, w, x, z
****
Q: ['4787', 'c', '1727', '9863', '8147', '3931', 'b', '1133', '3023', '7427', '7837', 'n', '7921', 'o', 'c', '3973', '1949', 'x', 'g', 'b', 'd', '8559', '8661', '4465', 'z', '369', 'q', 'e', 'y', '8629', '7665', 'i', 'r', 'n', 'z', '9115', '1393', '4899']

A: b, c, d, e, g, i, n, o, q, r, x, y, z
****
Q: ['r', 'e', '9055', '3123', '5023', 'j', '6923', 's', 'w', '5387', '6287', '6509', 's', '6413', '1807', '3947', '2161', '3593', '3887', 'j', 'g', '1593', '4755', 'h', 'u', '2943', 'k', '5921', '921', '1607', 'q', '7779', 'c', 'l', '5987', '9369']

A:
c, e, g, h, j, k, l, q, r, s, u, w
****