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: ['z', 'l', '1759', 'k', '8197', 'v', '931', '2587', '7219', '3455', 'e', '8135', 'm', 'n', 'm']

Output: e, k, l, m, n, v, z


Input: Consider Input: ['2313', '2073', 'd', 'e', 'o', '793', '4999', 'f', 'c', '4473', '4519', 'u', 'n', 'k', '69', '475', 'a', 'j', 'q', 'x', '5869', '9523', 'z', 'v', '9265', '5989', 'p', 'm', 'g', 'y', 'b']

Output: a, b, c, d, e, f, g, j, k, m, n, o, p, q, u, v, x, y, z


Input: Consider Input: ['2455', '5129', 'n', '7503', '6307', '8389', 'q', 't', '6311', 'r', 'v', 'a', 't', 's', 'n', 'o', 'o', '9401', 's', '2229', '6367', '5967', 'd', 'p', 'n', '1813', '9875', 'f', '5811', '4473', '279', '9131', 'l', '8153', 'c', 'i', 'f', '8983', '6473']


Output: a, c, d, f, i, l, n, o, p, q, r, s, t, v