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.

['1653', '3177', 'b', '2785', '2515', 'd', '5513', '5599', '2947', 'v', '2771', '5697', '2913', '4161', '5939', '2655', '6787', '9851', 'q', '3199', 'x', '1305', '9423', '9117', '4821', 'j', '7963', 'i', 's', '469', 'r', 'w']
b, d, i, j, q, r, s, v, w, x

['y', 'u', 'c', '5909', 'x', '9865', 'e', 'h', '5125', '4719', 'w', '8855', 'i', 'd']
c, d, e, h, i, u, w, x, y

['6367', 'c', '6905', '8071', 'g', '7525', 'q', 'c', '1003', 'i', '1033', '2483', '3337', 'z', 'j', '9425', 'r', '6429', '9277', '8657', 'k', '3433', 'o', 'a', '3183', '2463', 'h', 't', '2867', '2865', '7303']

a, c, g, h, i, j, k, o, q, r, t, z