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.

[EX Q]: ['g', 'h', 'g', 'g', 's', 'h', '2849', '2705', '1185', 'x', '5789', '8221', 'e', 'x', 'g', 'b', '4903', 'q', '1563', 'r', 'k', 't', '9047', 'p', 'p', '9397', 'u', '7473', 'f', 'o', 'y', '1957', '1039', '9905', 'i', '4829', 'q', 'w', 'k', 'p', 't', '563', 'g', 'l']
[EX A]: b, e, f, g, h, i, k, l, o, p, q, r, s, t, u, w, x, y

[EX Q]: ['8741', 'h', '2147', '373', 'c', 'r', '2639', '3511', '1393', 't', '7173', 'f', '9371', '7659', 'q', '4799', 'f', '1967', '1905', '8783', 'i', 'n', 'z', '6395', 'u', 'i', '1493', '1395', '1909', '477', 'i', '8547', '393', '2203', '6893', 'y', '2085', '6445', '7753', '4027', 'h', 'y', '7963']
[EX A]: c, f, h, i, n, q, r, t, u, y, z

[EX Q]: ['9727', '935', 'a', '7725', 'z', '7433', 'a', 'z', '8737', '8899', 'y', '917', '929', '7923', 'r', '4643', 'e', '9577', '2247', 'd', '8509', '6319', 'v', '4495']
[EX A]:
a, d, e, r, v, y, z