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: ['1931', 'c', 's', '8767', 'z', '8977', '9249', '365', 'p', '7187', 'p', '961', 'k', 'k', '423', '5999', '4697', '6251', '6441', '1821', 's', 's', 'f', '5365', 'z', '5113', 'y', 'k', 'i', '5627', 'u', 'w', '4103', '8035', '7105', 'o', 'n', 's', 'y']

Output: c, f, i, k, n, o, p, s, u, w, y, z


Input: Consider Input: ['4299', 'b', '4171', '7639', '6609', '927', '5249', 'o', 'p', '9851', 'e', '1311', '3777', '7799', '7687', '8809', 'c', 'r', '47', '1925', '1847', 'r', 'd', 'r', '1871', '5935', 'r', '2283', 'p', 'p', '2727', 'c', 'i', '7357', 'y', '5103', '6115', 'q', 'w', 'u', '9201', '4221', '7717', 'o']

Output: b, c, d, e, i, o, p, q, r, u, w, y


Input: Consider Input: ['3053', '7465', '8109', 'g', 'v', 'f', '5087', 's', 'q', 'd', '4233', 'q', '6239', 'd', 't', '4131', '553', '3871', 'n', '5923', 'l', 'g', 'c', 's', '8655', '1815', '7617', 'v']


Output: c, d, f, g, l, n, q, s, t, v