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

['7595', '5303', '3985', 'n', 'w', 's', 'r', 'f', '8237', 'q', 'y', 'f', '3121', '2463', '4597', 'q', '6801', 'f', 'i', '8563', '3267', 'k', '6157', 'f']
f, i, k, n, q, r, s, w, y

['3169', '6827', '1765', 'v', '7877', '4813', 'q', 't', 'g', '2001', '7721', 'l', '4417', '3041', '4679', 'q', '8133', '7557', '5859', '1185', 'x', 'a', '9491', 'j', 'd', 's', '9109', 'g', 'f', 'b', 'w', '7851', 'g', 'o', 'n', 't', '3839', '5727', 'u', '1165']

a, b, d, f, g, j, l, n, o, q, s, t, u, v, w, x