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.
--------
Question: ['f', 'j', '9195', '3155', '2855', '5333', '5263', '9279', '687', 'e', '3055', '7233', '13', 'j', 'p', 'i', '8327', 'm', 'h', '3977', 'h', '7997', 'a', 'h', '4661', 'x', '8237', 'a', '5009', 'o', 'p', 'z', '2293', 'q', 'p', '5469', 'k', 'q', 'b', 'n', '1967', '4991']

Answer: a, b, e, f, h, i, j, k, m, n, o, p, q, x, z


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

Answer: b, e, l, m


Question: ['e', 'j', 'p', 'w', 'd', 'j', '4377', '3607', 'o', 'd', 'w', '2111', 'e', 'h', 'c', 'j', 'n', 'k', '1143', '9131', '2291', 'c', '4921', '8629', '729', '3601', 'h', 'o', '943', 'i', '8817', '1263', '5379', 's', '5375', 'a', '5711']

Answer:
a, c, d, e, h, i, j, k, n, o, p, s, w