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.

['h', 'u', 'y', '7677', '9441', '1769', 'v', '1433', 'l', '7739', 'a', '8305', 'n', 'a', '6711', '3161', 'e', 'u', '993', '2211', '4011', 'q', 'o']
a, e, h, l, n, o, q, u, v, y

['7823', '2933', 'k', '4139', '5585', 'f', 'c', 'm', '2035', 'q', 'z', 'l', '1999', 'q', 'p', '7291', '2091', 'v', '423', 'e', 's', '6089', '4763', '6739']
c, e, f, k, l, m, p, q, s, v, z

['9127', '9141', '8113', 'u', '1005', '1849', 'y', '5981', 'r', '1869', 'z', 'a', '1165', 'x', '9805', '391', 'm', '4539']

a, m, r, u, x, y, z