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: ['r', '9489', 'e', 'n', '6323', 'd', '3163', '265', '8587', '7891']

Output: d, e, n, r


Input: Consider Input: ['3035', 'f', 'k', 'e', '3023', 'p', '9667', '5277', '4757', '8433', 'g', '1399', '7721', 'n', 'p', '7469', '7581', '5679', 'g', 'q']

Output: e, f, g, k, n, p, q


Input: Consider Input: ['l', 'j', '7281', '9475', 'q', '6277', 'j', '2863', '9203', 'v', '633', '2055', 'r', 'b', '2631', 'g', '2663', '4577', '8653', '3461', 'g', 'n', '6423', 'q', 'g', 'z', '7185', 'y', '3011', 'u', '5281', 'z']


Output: b, g, j, l, n, q, r, u, v, y, z