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: ['1367', 'h', '4153', '1587', 'h', 'b', 'n', 'u', 'n']

A: b, h, n, u
****
Q: ['f', '9027', 'z', '9601', 'w', '7747', '1135', 'j', '1871', 'd', 'u', 'f', 'd', 'x', 'k', '2009', 't', '4625', 'm', '1619', 'm', 'm', '3107', 'x', '3957', '2495', 'j', '201', 'a', '4635', 'r', '7407', 'b', 'r', 'z']

A: a, b, d, f, j, k, m, r, t, u, w, x, z
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Q: ['r', 'f', '2863', '3407', 'y', 'i', 'q', '6401', 'u', '9715']

A:
f, i, q, r, u, y
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