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: ['n', 'g', 'u', '2873', 'k', '4411', 'w', '8179', 'w', 'w', 'f', 'g', 'e', '7837', '3055', 'z', 's', '6037', 'n', '1479', 'c', '5311', 'i', 'w', 'z', '1891', '9663', 'y', 'f', 'h']

Output: c, e, f, g, h, i, k, n, s, u, w, y, z


Input: Consider Input: ['c', '8389', 'j', '6113', '5843', 'f']

Output: c, f, j


Input: Consider Input: ['a', 'q', '1257', '6127', '2269', '5709', '3583', '401', 'l', 's', '4469', 'b', 'y', 'n', 'v', '3393']


Output: a, b, l, n, q, s, v, y