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: ['p', '4329', '2437', '6279', 'u', '459', 'f', 'c', 'i', 'w', 'n', 't', '429', 'n', '73', '4995', 'p', 'z', '8459', '6133', 'y', 'r', '4057', 'a', '2717', '7803', 'r', 'm', '2879', '6989', '7223', 'v', '7929']

Output: a, c, f, i, m, n, p, r, t, u, v, w, y, z


Input: Consider Input: ['2633', 'd', 'r', '8083', 'f', 'd', '5121', '8651', 'o', 'b', '811', '7551', 'x', 'p', 'm', 'v', 'm', '7833', '1959', 'y', 'p', '779', '1889']

Output: b, d, f, m, o, p, r, v, x, y


Input: Consider Input: ['8977', '1015', '1891', '501', 'h', '2635', '1637', 't', 'o', '8327', 'q', '4595', 'e', '4009', 'l', '5137', '885', 'n', 'l', '99', '4695', 'z', '2253', 'o', '769', '337', '2333', 's', '4849', 'k', 'x', 'n', 'f', '8367', 'z', '739', 'l', '7385', '5183', '1841', '5009', '5727', '7335']


Output: e, f, h, k, l, n, o, q, s, t, x, z