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.

Input: Consider Input: ['m', 'z', 'd', '4667', 'v', '2881', '887', 's', '9861', 'd', '8821', '125', 't', '4493', '6749', '2983', '309', '6033', 'i', '3421', 'j', '4001']

Output: d, i, j, m, s, t, v, z


Input: Consider Input: ['b', 't', '2199', 'e', 'i', '1883', '5137', '8495', 't', '7377', 'm', '7665', '2009', 'o', '3757', 'm', '861', 'm', 'l', '9229', 'c', 'r', 'q', 'i', 'm', '705', 'b', '4301', 'd', 'l', 'f', '5485', 'h', 'p', '4529', '7879', 'f', 'b', 'm']

Output: b, c, d, e, f, h, i, l, m, o, p, q, r, t


Input: Consider Input: ['f', 'l', '6165', '1921', 'm', 's', 'n', 'a', '6015', '1835', '4083', 't', '2067', 'o', 'k', '5649', 'h', 'p']


Output: a, f, h, k, l, m, n, o, p, s, t