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]: ['4045', '4739', 'd', 'e', '6789', 'e', 'q', '4909', '9511', 'h', '9543', '6725', 'a', '3683', 'q', 'k', 'd', 'q', 'z', 'b', '3245', '9877', '9155', '7751', 'e', '1015', '2379', 'f', 'y', '1121', '9801', 'c', 'h', 'l', 'f', '67', 'v', 'v', 'y', 'c', '3871', 'v', '5893', 'a']
[EX A]: a, b, c, d, e, f, h, k, l, q, v, y, z

[EX Q]: ['r', 's', '3409', 'a', 'e', '6855', 'i', 'n', '8655', 's', 't', '8401', 'u', '9603', '8815', 'q', 'a', 'x', 'i', '8455', 'e', '5877', '3917', 'p']
[EX A]: a, e, i, n, p, q, r, s, t, u, x

[EX Q]: ['9981', '531', '7967', 's', '117', '8735', 'w', '8609', '9563', 'p', 'e', '5155', '5465', 'i', 'j', '8027', 'e', 'q', 't', '6473', '3249', '5835', 'z', 't', '5897', '3047', 'f', 'y', 'e', '1917', '615', 'k', '5947', '6539', 'v', 'e', 'y', '115', '1617', 'a', 'z', '5519', '9287', '101']
[EX A]:
a, e, f, i, j, k, p, q, s, t, v, w, y, z