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', '8229', '2731', '6595', '4675', 'n', 'a', '7361', '7401', '7273', 'b', '279', '5539', '7919', 'j', 'x', '9521', '8837', '7391', 'h', 'x', 'h', '7283', 't', '3769', '2317', '9131', 'h', 'y', 'c', '1625', 'm', 'e', 'a', '8437', '7543', 'p', '2451', 'k', 'r']

Output: a, b, c, e, h, j, k, m, n, p, r, t, u, x, y


Input: Consider Input: ['a', '2579', 'f', '6787', '123', '225', '6499', '4419', 'o', '1785', '7981', 'z', 'b', '2441', '2821', 'o', 'k', '2747', 's', 'u', 'q', '3901', '7629', 'k', 'm', 'q', '6577']

Output: a, b, f, k, m, o, q, s, u, z


Input: Consider Input: ['2009', '7941', 'b', '2087', '5691', '8805', 'l', '483', 'k', '2235', '8361', 'g', 'q', 'm', 'h', '2389', 'w', '1217', 'd', 'd', 'u', 'o', 'z', 'z', '8723', 'y', '9585', '3339', 'y', '9461', '2377', '1611', '4465', 'u']


Output: b, d, g, h, k, l, m, o, q, u, w, y, z