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.

['3743', '765', '5299', '3069', '8547', '8991', '1811', 'k', '5557', '4907', '5907', 'd', 'r', 'z', '5385', '5463', 'f', '2063', 'm', '3419', 'k', '3897', '4049']
d, f, k, m, r, z

['u', 'o', 'b', 'b', '5873', 'w', 'v', '4171', '7957', '3501', '2563', 'l', 'q']
b, l, o, q, u, v, w

['6763', 'o', 'c', '3573', 's', 't', '1137', 'g', '2817', 'c', '6531', 'h', 'u', 'c', 'w', '4727', '5611', '1345', 'p', '9523', '2127', 't', '4081', 't', 'h', '4525', '6983', '9557', 'k', '3535', '9507', 'b', 'z']

b, c, g, h, k, o, p, s, t, u, w, z