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]: ['4371', '9499', 'e', 'w', '9969', '8367', '2897', '1745', 'i', '7049', '9773', 'h', '9649', 'u', '4673', '8513', '8547', 'z', '1995', '7739', '2215', '171', 'c', '7527', '2479', 't', '5223', 'p', '2313', '3243', '2281', 'r', 'c']
[EX A]: c, e, h, i, p, r, t, u, w, z

[EX Q]: ['f', '6817', 'f', 'd', '3835', '3051', 'u', 'l', '7679', 'b', '3931', '1441', 'q', '8675', 's', '5487', 'y', '2279', 'x', 'y', '9513', '2875', '1771', '879', '2927', '3469', 'v', 't', 'k', '9991', '2565', '7345', '973', 'w', 'i', '6105']
[EX A]: b, d, f, i, k, l, q, s, t, u, v, w, x, y

[EX Q]: ['57', 'x', 'h', '2017', '5239', 'm', '8537', '7705', '3161', 'k', 's', '7147', '5349', 's', '7339', 'i', 't', 'u', '465', '2295', 'i', 'y', '7305', '3715', 'o', '55', '7271', '2081', '5135', '2159', '5705', '4393', '685', '5097', '6569', '4451', 'm', '2999', 'j', 'f', '273', '7837', '6909', '6093']
[EX A]:
f, h, i, j, k, m, o, s, t, u, x, y