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: ['5973', 'h', '4081', 'i', '8059', 'w', 'j', '6175', 'w', '8685', '5811', 'k', 'n', '5577', '9817', 'v', '8617', 'u', 'y', '3921', 'b', '1027', '5405', 'a', '3501', '6659', 's', 'e', '157']

A: a, b, e, h, i, j, k, n, s, u, v, w, y
****
Q: ['6209', 'x', 'j', 'w', '7965', '4905', '6297', '4291', '7183', 'a', 'l', '5267', 'r', '5935', 'a', '7865', 'h', 'p', '6117', 'a', 'y', 'y', 't', 'v', '7271', 'e', 'e', 'z', 'i', 'l', '4731', '2059', 'm', '5703', 'k', 'f', '8125', 'e', '7569', 'r', '2287', '593']

A: a, e, f, h, i, j, k, l, m, p, r, t, v, w, x, y, z
****
Q: ['m', '7389', '1181', 'm', '6127', '9911', 'y', '5217', '4357', '1281', '4253', 'g', 'e', '753', 'b', 'n', 't', 'j', 'm', '3813', 't', '761', '537', 'r', '8295', 'v', '1415', 't', '5175', '2285', 'u', 'm', 'x', 'b', 'l', 'f', 'w', 'c', 'd', 'r']

A:
b, c, d, e, f, g, j, l, m, n, r, t, u, v, w, x, y
****