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: ['i', 's', 'f', 'i', '2293', '245', '4983', 'h', 'h', '6203', '8703', '1613', 'h', 'o', '3635', '8069', '2829', '1939', 'u', 'm', '5305', 'n', 'k', '9367', 'u']

A: f, h, i, k, m, n, o, s, u
****
Q: ['3223', 'h', 'w', 'f', 'y', '1667', '8843', '8759', '9203', '3305', '3549', '5507', '6251', 't', '8319', '9121', '6643', 'u', '4273', '4429', '7543', '7909', '789', '9183', '5729', 'd', '7063', 'b', '6677', 'w', 'x', 'x', 'z', '769', 'p', 'd', 'h']

A: b, d, f, h, p, t, u, w, x, y, z
****
Q: ['5863', 'b', 'j', 'w', 'l', '2599', '5007', 'h', 'i', '5011', 'n', '4131', '2741', 'z', 'd', '7363', '5955', 't', 'g', '4911', 'g', '5587', 'u', '1527', 'v', '6629', 'k', '2059', '4307', 'd', 'f', 'f', 'i', '6323', 's', 'h', '5129', 'x', 'p']

A:
b, d, f, g, h, i, j, k, l, n, p, s, t, u, v, w, x, z
****