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: ['315', '9975', '3013', 's', '6131', 'e', 'e', 'u', 'a', '1729', 'g', 't', 'y', 'f', '7523', 'e', 'g', '489', 'm', 'p', 'f', 'e', '2077', 'e', 'g', 'c', 'l', '6389', 'k', 'b']

A: a, b, c, e, f, g, k, l, m, p, s, t, u, y
****
Q: ['f', '7573', '2067', 'n', '3671', '7969', '7889', '4893', '6501', 'l', 'y', '4331', 'a', 'e', '2081', '3863', 't', 'j', '7921', 's', '7203', '7797', 'f', '4279', '1299', '987', '5003', '9071', '9559', '6061', '1889', '2653', 'm', 'w', '665', '7343', '9763', 'r', '6343', '9393', '9289']

A: a, e, f, j, l, m, n, r, s, t, w, y
****
Q: ['4541', '809', '3253', '4547', 'c', '7629', 'i', 'm', '6295', '8699', 'e', 'e', 'l', 'n', '7807', 'r', 'g', 'c', '869', '2167', '9035', '735', 'w', '365', 't', '869', 'x', '8865', 'c', '4953', '727', 'x', '8087', '4909', 'q', 'm', 'c']

A:
c, e, g, i, l, m, n, q, r, t, w, x
****