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.

Input: Consider Input: ['u', '4021', 'u', 'd', 'j', 'p', 'i', 'z', '3223', 'f', 's', 'l', 'p', 'd', '5031', '1059', '7875', '2097', 'q', 'i', '8813', '2017', 'h', 'l', 'y', '57', '1561', 'f', 'j', 'z', '1901', 'u', 'j', 'x', '6561', '9239', '3333', '8793', '4915', '5821', 'h', 'f', '765', 'x']

Output: d, f, h, i, j, l, p, q, s, u, x, y, z


Input: Consider Input: ['1649', 'l', 'i', '5901', 'o', 'g', '1197', 'a', '9327', '9835', '1095', 'k', '4489', '9149', 'o', '3095', 'z', 'u', 'y', '561', '7419', 't', 'j', '8763', 'v', '339', 'y', 'w', 'v', 'v', '1867', 'd', 'r', 'w', 'h', 'j', '1531', '3841']

Output: a, d, g, h, i, j, k, l, o, r, t, u, v, w, y, z


Input: Consider Input: ['a', '2957', 's', '8551', 'b', 'n', '1799', '9137', 't', '2921', '7001', 'j', '9225', '7195', 'r', '5527', 'y', '969', 'n', 'f', 'w', 'n', '4063', '5441', 'a', '683', 'f', '9707']


Output: a, b, f, j, n, r, s, t, w, y