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: ['3043', 'r', 'm', 'i', '2653', 'i', '1703', '1125', '6299', '4863', 'n', 'h']

A: h, i, m, n, r
****
Q: ['n', 'g', 'u', '2873', 'k', '4411', 'w', '8179', 'w', 'w', 'f', 'g', 'e', '7837', '3055', 'z', 's', '6037', 'n', '1479', 'c', '5311', 'i', 'w', 'z', '1891', '9663', 'y', 'f', 'h']

A: c, e, f, g, h, i, k, n, s, u, w, y, z
****
Q: ['f', 'b', 'u', '6709', 'p', '1025', 'o', 's', '8731', '8047', '4233', 'a', 'w', '5429', 'd', 'n', '9903', 'c', 'y', '6479', 'h', '3251', '6647', 'z', 'j', '6823', '9807', '7179', 'u', '6805', 'p', 'j']

A:
a, b, c, d, f, h, j, n, o, p, s, u, w, y, z
****