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: ['8527', 'p', '4697', '8415', 'v', 'l', '2669', '2649', '4349', '4201', 'r', '7573', '2041', 'f', '8047', 'u', 'm', 'm', 'j', '5695']

A: f, j, l, m, p, r, u, v
****
Q: ['a', 'w', 'm', 'g', 'c', '5475', '7391', 't', '1049', 'p', 'd', '1397', 'k', 'x', 'j', '2525', 'f', '741']

A: a, c, d, f, g, j, k, m, p, t, w, x
****
Q: ['5339', 'r', '7607', '4253', 'r', '167', '1157', '7841', '7657', 'a', 'n', '1685', '245', 't', 'x', 'w', 'e', '6551', 'l', 'f', '9537', '4605', '4131', 'z', 'x', 'l', '5273', '1003', '1233', '5513', '3605', 'x', 'f', '8343', 'p', '319', 's', '1153', 'y', 'a', 'z', '8993']

A:
a, e, f, l, n, p, r, s, t, w, x, y, z
****