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: ['2381', '2865', '4821', 'n', 'u', 's', 'p', 'v', 'v', 'n', '1349', '7903', 'm', '193', 't', 'p', 'c', '3521', 'a', 't', '8281', 'i', '151', '4783', 'm', '3387', '9551', 'z', 'q', 'v', '4549', '4411', 'u', '8735', '2645', '359', '2871', '5923', '5071', 'c', '9843', 'i']

Output: a, c, i, m, n, p, q, s, t, u, v, z


Input: Consider Input: ['i', 'y', '8339', 'd', 'b', '7471', '6577', '9037', '4503', '6287', '1439', '8863', '9201', '2661', 'x', 'l', 'v', 'w', 'a', 'f', '8885', '519', '7631', 'g', '7203', '8605', '2429', '9165']

Output: a, b, d, f, g, i, l, v, w, x, y


Input: Consider Input: ['3939', 'y', '5219', '2277', 'c', '9025', '3357', '3543', 'p', 'r', 'x', '2179', '4859', '5653', '6173', 't', 'm', '2511', 'g', 'h', '9061', 'e', '2151', '9833', '1023', 'x', 'z', 'd', 'k', 'u', '4303', '9275', 'j', 't', '9885', '4707']


Output: c, d, e, g, h, j, k, m, p, r, t, u, x, y, z