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.

Example Input: ['g', '4165', 'n', 'w', 'n', 'e']
Example Output: e, g, n, w

Example Input: ['a', 'a', 'b']
Example Output: a, b

Example Input: ['p', '5817', 'g', '7001', 'n', 'e', 'j', '3219', '9259', '7899', 'v', '4289', 'k', '7271', 'k', '6979', 'l', 'o', '2017', 'h', '5789', 's', 'e', '2635', 'o', '9867', '3511', '6777', 't', '397', '6941', 'n', '9439', 's', '4093', 'l', '1767', 'q', 'i', 'w', 'k', 'b', '1659', 'f']
Example Output:
b, e, f, g, h, i, j, k, l, n, o, p, q, s, t, v, w