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: ['3611', '6825', 'j', 'e', 'r', 'a', '8889', 'y', 'x', 'k', '2651', '4545', '2289', 'r', 'q', '3163', 'a', 'i', 'j', 't', 'b', '2673', '4307', 'q', '5839', 'w', 'g', '6221', 'g', 'h', 'h', '5815', 'n', '3551', '7709', 'z', '2281', '7987', 'w', 'a', '2319', '3337', '3409']

A: a, b, e, g, h, i, j, k, n, q, r, t, w, x, y, z
****
Q: ['3127', '9253', '5667', '9453']

A: -1
****
Q: ['u', '9631', 'i', 'f', '7', 't', 'k', 't', '4869', '6881']

A:
f, i, k, t, u
****