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]: ['e', '2239', 'l', '8309', 'i', '2613', 'i', '611', '6481', 'j', 'v', '1867', '415', '269', '8053', '3369', 'q', 't', '2303', '7729', '1059', '6135', '3299', 'd', '6855', '207', '6227', '7859']
[A]: d, e, i, j, l, q, t, v


[Q]: ['u', '4731', 'l', 'p', '1997', '601', 'n', 'l', 'p', '211', '7355', '6537', 'w', 'x', '1741', '8145', '3689', 'm', 'y', '6945']
[A]: l, m, n, p, u, w, x, y


[Q]: ['3599', '7755', '4313', '6491', 'c', 'g', 't', 'x', '8619', 'x', 'd', 'o', 'o', '4541', '9507', '43', '9773', '3473', 'v', '2761', 'l', 'p', '8155', 'e', '6105', 'm', '1571', '9203', 'p', '2693', '2147', 'r', '2065', 'p', '5721', '6117']
[A]:
c, d, e, g, l, m, o, p, r, t, v, x