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: ['8005', 'q', 'w', 'a', 'f', 'o', '6017', '7591', 'm', 'p', 'z', 'q', 'u', 'o', 'd', '6043', 'f', '3575', 'r', '2885', 'o', '3141', '621', '2375', 't', '5397', 'h', 'b', 'i', '3785', '1551', 'i', '8879', 'g', '5237', '7111', '2057', '1743', '9895', '2613', 'i', 'z', '677']

SOLUTION: a, b, d, f, g, h, i, m, o, p, q, r, t, u, w, z

PROBLEM: ['4749', '4607', '625', '6907', 't', 'b', '8479', '6505', 'r']

SOLUTION: b, r, t

PROBLEM: ['3591', 'n', '1219', 'q', '4671', '9693', '8757', '4789']

SOLUTION:
n, q