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: ['2453', 'r', 'd', '8499', 't', 's', 'h', 'a', 'm', '9271', 'g', '2599', '6209', 'o', 'i', '4069', 't', '6793', '7679', '6643', '7359', 'm', 'f', 'w', '775', '3347', '6161', '9745', 'i']

Output: a, d, f, g, h, i, m, o, r, s, t, w


Input: Consider Input: ['d', 'o', '7643', '9065']

Output: d, o


Input: Consider Input: ['5515', '4681', 'n', 'j', '3867', '2953', '577', 'a', '8383', '1015', '9703', '6023', '2343', '4291', 'h', '3953', 'g', 'h', '2355', 'u', 'f', '3631', 'l', 'v', '5351', 'x', 'z', '2611', '5025', '1115', 's', '2485', 'k', 's', '6751', 'y', '5505', '3171', 's', 't']


Output: a, f, g, h, j, k, l, n, s, t, u, v, x, y, z