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.

['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']
c, e, h, i, p, r, t, u, w, z

['5011', 'l', '925', 'e', 'b', '3077', 'm', '4541', '781']
b, e, l, m

['h', 'q', '6941', 'e', '2661', '223', 'c', '3369', 'm', '7963', 'p', 'l', 'k', 'd', '6041', 'w', 'z', '5231', '9033', '3909', '5019']

c, d, e, h, k, l, m, p, q, w, z