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.
--------
Question: ['f', 'w', 'y', 't', '5269', '9989', 'p', 'v', '6609', 'v', 'c', 'q', 'm', '6565', '189', 'm', '3617', 'b', '9147', '665', 'v', '5989', '1511', '3123', '6667', '4661', '185', 'b', '3405', 'b', '6027', 'n', '6973', '505', 'g', '815', '3439', '2069', '291', 'j', 'f', '1121', '8009', 'm', '8353']

Answer: b, c, f, g, j, m, n, p, q, t, v, w, y


Question: ['a', 'p', 'y', 'l', 'l']

Answer: a, l, p, y


Question: ['9335', 'i', '1181', 'k', '241', 'z', 'w', '5643', 'k', 'g', 'g', 'j', '7189', '1801', '8315', 'o', 'j', '8103', '9183', 'n', '1309', '5075', '131', 't', '277', '3767', '2675', '5717', '9553', 'u', 'p', 'n', '9763', 'z', '7773', '5653', '3511', 't', 'd', 's', 'j', 'l', '3619', 'm']

Answer:
d, g, i, j, k, l, m, n, o, p, s, t, u, w, z