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: ['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: ['m', '8127', '7519', '4543', '2809', '9855', 'n', '6241', 'w', 'w', 'q', 'w', 'p', '8599', '7819', '3817', 'm', 'q']

Output: m, n, p, q, w


Input: Consider Input: ['g', 'n', '5469', 'l', 'i', 'c', 'k', '9775', '245', 'h', 'h', '5783', 'z', '6393', 'k', 'g', 'i', 'j', 'm', 'h', '8799', 'l', '1755', 'u', '2783', '931', '1917', 't', '4543', 'x', 'g', '3919', 'u']


Output: c, g, h, i, j, k, l, m, n, t, u, x, z