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.

['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']
c, f, h, i, n, q, r, t, u, y, z

['g', '8591', '4463', '2189', '7901', '1457', 'f', 'i', '9031', 'r', '5519', '3955', 'd', '2093', 'c', 'y', '6591', '6463', 'h', '4371', '111', 'p', '3221', '4185', 'p', '8761', 'w', 'p']
c, d, f, g, h, i, p, r, w, y

['3799', '4481', '7523', 'c', 't', 't', 'p', 'y', '7593', 'a', '1609', '3509', '3825', '5233', '8433', 'z', 'd', 's', 'r', 'r', 'k', 'b', '2079', 'k', 'x', 'w', 'p', 'h', '9329', '999', 'x', '3143', 'q', 'b', '9595']

a, b, c, d, h, k, p, q, r, s, t, w, x, y, z