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: ['o', '4167', 'b', '1651', '8327', '9219', 'o', 'v', '5841', '6057', 'i', 'q', 'o', 'r', 'a', '7069', 'y', 'h', 'd', '3775', 'j', 't', '3663', '55', '7117', 'e', 'u', 'm', '931', '5777', '8773', '4891']

Answer: a, b, d, e, h, i, j, m, o, q, r, t, u, v, y


Question: ['8741', 'h', '2147', '373', 'c', 'r', '2639', '3511', '1393', 't', '7173', 'f', '9371', '7659', 'q', '4799', 'f', '1967', '1905', '8783', 'i', 'n', 'z', '6395', 'u', 'i', '1493', '1395', '1909', '477', 'i', '8547', '393', '2203', '6893', 'y', '2085', '6445', '7753', '4027', 'h', 'y', '7963']

Answer: c, f, h, i, n, q, r, t, u, y, z


Question: ['y', 'a', '8559', 'l', '2447', '5325', 'v', '3883', 'u', 'a', 'a', 'e', '5461', 'v', 'y', 's', 'j', 'h', 'l', 'k', 'l', 's', 'a', '1685', 'z', 'l', '8841', 't', '8217', 'q', '7847', 'l', 'h']

Answer:
a, e, h, j, k, l, q, s, t, u, v, y, z