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: ['l', '1213', 'm', 'k', '7825', '3501', '2397', '2313', 'v', '4119', 'h', 't', '6137', 'l', '9851', 'q', '9661', 'b', 'z', '1437', '1759', 'l', '611', '5085', '4443', 'n', 'u', 'b', '2511', '6023', '7157', 'n', '9921', 'o', 'a', 'o', 'w', 't', 'o', '1607', '6751', 'n', 'b']

Output: a, b, h, k, l, m, n, o, q, t, u, v, w, z


Input: Consider Input: ['2453', 'r', 'd', '8499', 't', 's', 'h', 'a', 'm', '9271', 'g', '2599', '6209', 'o', 'i', '4069', 't', '6793', '7679', '6643', '7359', 'm', 'f', 'w', '775', '3347', '6161', '9745', 'i']

Output: a, d, f, g, h, i, m, o, r, s, t, w


Input: Consider Input: ['k', 'r', 'u', '2235', '9113', 'a', 'd', 'l', '6395', '2795', 'x', 'a', '4599', '723', '641', '4531', 'p', 'l', '4683']


Output: a, d, k, l, p, r, u, x