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: ['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: ['9223', 'w', '8631', '4453', '9975', 'y', '9747', 'g', '7077', '2593', '6015', 'n', '7345', 'i', '7807', '299', 'q', '3629', '2545', 'k', 'm', 'q', '5155', '5633', 'x', 'q', 'i', '27', 'f', '7919', 'p', '4835']

A: f, g, i, k, m, n, p, q, w, x, y
****
Q: ['787', '9299', 'b', '1307', '143', 'l', 's', '1887', '8849', 'a', 'z', 's', 'f', '3927', 'c', '3247', '3025', '8935', 'k', 'r']

A:
a, b, c, f, k, l, r, s, z
****