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.

Q: ['u', '8229', '2731', '6595', '4675', 'n', 'a', '7361', '7401', '7273', 'b', '279', '5539', '7919', 'j', 'x', '9521', '8837', '7391', 'h', 'x', 'h', '7283', 't', '3769', '2317', '9131', 'h', 'y', 'c', '1625', 'm', 'e', 'a', '8437', '7543', 'p', '2451', 'k', 'r']

A: a, b, c, e, h, j, k, m, n, p, r, t, u, x, y
****
Q: ['b', 't', '2199', 'e', 'i', '1883', '5137', '8495', 't', '7377', 'm', '7665', '2009', 'o', '3757', 'm', '861', 'm', 'l', '9229', 'c', 'r', 'q', 'i', 'm', '705', 'b', '4301', 'd', 'l', 'f', '5485', 'h', 'p', '4529', '7879', 'f', 'b', 'm']

A: b, c, d, e, f, h, i, l, m, o, p, q, r, t
****
Q: ['5973', 'q', 'd', '553', 'e', '8479', '9825', '399', 'u', '3001', '531', 't', '6711', 'q', '7743', '1657', 'w', '6293', '8951', 'i', 'o', '5041', '6895', 'z', 'k', 't', 'l', 'q', '533', '6425', '2979', '3477', '1727', '223', 'w', 'e', '7427', 'h', 'c', 'g', 'l', '3607', '8957', '5997']

A:
c, d, e, g, h, i, k, l, o, q, t, u, w, z
****