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]: ['7155', 'y', '145', '7147', 'u', '8453', 'd', '3693', '6471', '5289', 'n', 'p', '8289', '2929', '199', 'e', '8377', '8937', '5315', 't', 'l', '7715', 'c', 'y', 'f', '9999', 'p', '3655', '5489', 'q', '2321', '9881', '2265', 'n', 'v', '455']
[A]: c, d, e, f, l, n, p, q, t, u, v, y


[Q]: ['9467', 'o', '8347', '7125', '7999', '1737', 'h', '7043', '8617', '2033', '9959', '2349', 'p', '9389', '5525', 'w', 'u', 'p', '4703', '9807', 's', 'f', '2359', '7357', '2471', '5447', 'f', 'w', '2865', '6627', '3211', 'y', '23', 'z', 's', '1517', '3553', 'r', '2251']
[A]: f, h, o, p, r, s, u, w, y, z


[Q]: ['z', 'w', '1429', 'p', '6867', '4409', 't', '4671', '4099', '9887', 'a', '6997', '4143', '2227', 'g', '2693', '3069', 'o', 'c', 'j', '9291', '3963', '5953', '2965', '7875', 'i', '2841', 'a', '8693', '721', '1527', '6829', '5205', 'l', '1255', '5007', 'o', '4737', 'f', 'm', 'y', 'e']
[A]:
a, c, e, f, g, i, j, l, m, o, p, t, w, y, z