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.

['789', '3603', '3517', '5831', 'z', 'q', 'w', 'l', '5701', '9503', '8169', '1123', 'e', '529', 'j', 'z', 'l', 'o', '3705', 'o', '5131', '6063', 'c', 'j', '6275', '7701']
c, e, j, l, o, q, w, z

['z', '8407', 'y', 'h', '1377', '3511', '1449', 'z', '3991', 'n', 'x', 't', 'h', '6389', '8049', '6091', '7787', 'p', 'l', '5815', 'k', 'e', 's', 'a', '9491', 'w', '1909', '4801', '4725', 'i']
a, e, h, i, k, l, n, p, s, t, w, x, y, z

['8933', '9759', 'w', '8395', '5833', '8879', '2269', 'j', '6303', '4161', 'i', '9977', '61', '3975', 'i', 's', '963', 'v', 'g', '6897', '5905', '469', '2619', '2751', '731', '6593', 'o', '9145', 'o', '1481', '5615', 'd', 'i', '3677', 'j', 'k', '4583', 'y', 'r', 'z', 'f', '3819', '6441']

d, f, g, i, j, k, o, r, s, v, w, y, z