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: ['2329', 'i']

A: i
****
Q: ['5161', 'v', 'y', '6005', 'y', 'l', '5451', 'z', 'j', 'd', '4597', '9319', '1241', 'g', 'f', 'b', 'g', '683', '763', 'm']

A: b, d, f, g, j, l, m, v, y, z
****
Q: ['u', '3623', 't', '5383', '137', '3937', '3409', '9023', '7893', '1311', 'z', 'u', 'k', '8003', 'j', 'z', 'f', '5679', 'e', 'q', 'v', 'o', 'd', '3183', 'w', '5041', 'i', 'u', '7819', 's', 's', '8617', 'u', 'h', '2997', 'e', '2687', 's']

A:
d, e, f, h, i, j, k, o, q, s, t, u, v, w, z
****