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: ['1593', '8165', 'q', '6689', 'b', 'r', '373', 'g', '6505', '415', '495', 'j', 'j', 'f']

A: b, f, g, j, q, r
****
Q: ['2381', '2865', '4821', 'n', 'u', 's', 'p', 'v', 'v', 'n', '1349', '7903', 'm', '193', 't', 'p', 'c', '3521', 'a', 't', '8281', 'i', '151', '4783', 'm', '3387', '9551', 'z', 'q', 'v', '4549', '4411', 'u', '8735', '2645', '359', '2871', '5923', '5071', 'c', '9843', 'i']

A: a, c, i, m, n, p, q, s, t, u, v, z
****
Q: ['9571', 'f', '6625', 's', '1185', 's', 'z', 'h', 'x', '8681', 'y', '4951', '7267', 'z', '7881', '8585', '7997']

A:
f, h, s, x, y, z
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