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: ['a', 'y', '7401', 'e', 'l', '4351', 'p', '5673', 'k', '333', 'o', 'd', 'e', 'j', 'e', '9569', '1795', 'r', 'z', '6059', '4399', '2927', 'n', '9387', '9317', 'b', 'c', 'e']

Output: a, b, c, d, e, j, k, l, n, o, p, r, y, z


Input: Consider Input: ['2633', 'd', 'r', '8083', 'f', 'd', '5121', '8651', 'o', 'b', '811', '7551', 'x', 'p', 'm', 'v', 'm', '7833', '1959', 'y', 'p', '779', '1889']

Output: b, d, f, m, o, p, r, v, x, y


Input: Consider Input: ['5169', '3347', '1219', 'r', '5755', 'k', '2835', 'u', '8817', 's', 'z', '2145']


Output: k, r, s, u, z