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: ['o', '369', 'z', '5721', 'w', 'v', '4973', '7773', 'k', '3071', '5103', '425', '4239', '7977', 'n', 'i', 'k', '8117', '9843', 'n', 'd', '1353', 'h', 'd', 'v', 'z', 'j', '8727', '6997', 'x', '767', '4331', 't']

A: d, h, i, j, k, n, o, t, v, w, x, z
****
Q: ['d', 'a', '6931', 'c', 'u', 'z', '9713', 'v', 'm', 'e', 'k', 'o', '9705', 'a', '5373', 'c', '2983', '8097', 'h', '3039', 'g', 'f', 'n', 'v', '853', '8227', '7573', 'j', 'h', 'k', 'o', 'k', '8897', 'd', 'g', 'd', 'd', '4039']

A: a, c, d, e, f, g, h, j, k, m, n, o, u, v, z
****
Q: ['m', '365', '7637', 'n', 'h', '1057', 'n', '8769', '2591', '6821', 'r', 'c', 'q', '6349', 'q', 'f', 'x', '6271', '7669', '1503', 'c', '5041', '2005', '7753', '5087', '4243', 's', 'c', '6763', '681', '4691', 'b', 'n', '7697', '429', 'l', 'g', 'p', 'h', '5475', '3423', 'u', 'o']

A:
b, c, f, g, h, l, m, n, o, p, q, r, s, u, x
****