TASK DEFINITION: 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.
PROBLEM: ['6585', 'i', 'p', '5623', '3557', '8011', 'c', '6389', 'h', 'h', 'd', '1823', '5567', 'v', 'p', 'x', 'c', '2161', '3649', 'o', '6227', 'f', '9975', 'd', 'm', '2587', 'o', 't', 'k', '7637', 'm', 'l']

SOLUTION: c, d, f, h, i, k, l, m, o, p, t, v, x

PROBLEM: ['h', 'u', 'y', '7677', '9441', '1769', 'v', '1433', 'l', '7739', 'a', '8305', 'n', 'a', '6711', '3161', 'e', 'u', '993', '2211', '4011', 'q', 'o']

SOLUTION: a, e, h, l, n, o, q, u, v, y

PROBLEM: ['1217', 'u', '7181', '5271', '3403', '2681', '49', 'l', '6237', 'o', '3229', 'e', '7235', '4513', '2089', 'h', '6045', 'd', 'h', 'h', '1633', '2091', '5455', 'w', 'f', 'u', '1667', 'i', 'b', 'w', '1351', '3155', '8255', 'z', '7329', 'h', 'z', '1979']

SOLUTION:
b, d, e, f, h, i, l, o, u, w, z