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: ['f', '9203', 'w', 'f', '3751', '8095', '1319', 'f', '3017', 'r', 'y', '8221', '2715', '9959']

Output: f, r, w, y


Input: Consider Input: ['h', 'v', '1263', 'y', '3299', 'd', 'a', 'h', 's', '2007', '7597', '1015', 'k', '6643', '6959', 'g', 'u', 'd', '5737', 'n', 'z', 'y', 'b', 'g', '9059', '7349', 'j', 'w', 'i', 'z', 'p', '5809', 'x', '4421', 'g', '6399', '3965']

Output: a, b, d, g, h, i, j, k, n, p, s, u, v, w, x, y, z


Input: Consider Input: ['s', 'c', '1223', 'l', '9247', '3309', '57', '4479', 'z', '6313', 'p', 'p', 'p', '3347', '5573', '899', 'y', '6747', '8097', '8777', '7845', '4387', '7275', '5737', '5369', 's', 'y', '7509', 'd', 't', 'i']


Output: c, d, i, l, p, s, t, y, z