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]: ['w', 'g', '1649', 'a', '2115', '6763', 'r', 't', 'l', 's', 'y', '5659', 'a', 'b']
[A]: a, b, g, l, r, s, t, w, y


[Q]: ['t', 'c', 'r', '4459', 'o', '1407', 'x', '1515', '331', 'm', '1535', 'p', 'u', 'g', '2513', 'o', '7827', '8149', 'd', 'z', 'q', '5655', 'x', '9997', '2809', 'g', 'h', '6309', 'a', 'j', '9773', '2115', 't', '9113', 'q', 'o', '427', 's', '3815', '5423', 's', 'n', 'i', 'o', '3643']
[A]: a, c, d, g, h, i, j, m, n, o, p, q, r, s, t, u, x, z


[Q]: ['e', '2729', '3677', '6879', 'p', '5405', 'n', 's', 'v', 'w', '4313', 'm', '1139', '9695', '3239', 'p']
[A]:
e, m, n, p, s, v, w