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: ['l', 'i']

Output: i, l


Input: Consider Input: ['f', 't', '2135', '8397', '6361', '389', '2253', 'x', 'p', '4833', '5785', 'x', '1811', '9639', '5739', '175', '3231', '5931', 'r', 'c', 'g', 'h', 'p', '909', 'p', '587', 'a', 'a', 'h', 'q', 's', '5945', '4911', 't', 'h', '7517', 'p', '3177', 'h', 'u', '3577', '7055', 'l']

Output: a, c, f, g, h, l, p, q, r, s, t, u, x


Input: Consider Input: ['q', '9591', 'v', '2171', 'v', '7701', 'o', 'w', '5955', '4211', 'j', 'd', '4861', 'n', '8863', '5755', '7831', '7169', 'u', 'g', '1327', 'r', '3859', '7451', '2627', '2349', '7611']


Output: d, g, j, n, o, q, r, u, v, w