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.

Q: ['u', '8229', '2731', '6595', '4675', 'n', 'a', '7361', '7401', '7273', 'b', '279', '5539', '7919', 'j', 'x', '9521', '8837', '7391', 'h', 'x', 'h', '7283', 't', '3769', '2317', '9131', 'h', 'y', 'c', '1625', 'm', 'e', 'a', '8437', '7543', 'p', '2451', 'k', 'r']

A: a, b, c, e, h, j, k, m, n, p, r, t, u, x, y
****
Q: ['2103', '7937', 'v', '7641', '6609', '269', '4463', '4333', 'c', '8407', '4883', '6283', 'a', '8643', '3365', '1929', 'v', 'o', '2107', '7453', '9157', '5581', '5187', 'f', 'k', '8227', '6295', 'b', 'y', '4995', '1187', 'k', 'n', 'p', 'z', '8165', 'n', '7345', 'l']

A: a, b, c, f, k, l, n, o, p, v, y, z
****
Q: ['q', 'r', '4345', 'x', 'c', '8399', 't', 'g', '4287', 'c', '4055', '6537', '8515', 'd', 't', '1769', '4409', 'm', 'm', '1', 'm', '1949', '2491', '1039', 'q', '2203', 'c', 'x', '1307', 'n', 'c', '4071', '6689', '7077', '6443', '8213', '8275', 'y', 'u', '2365', '6069', '1491', '8583', '8407']

A:
c, d, g, m, n, q, r, t, u, x, y
****