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: ['8319', 'f', 'w', 'w', 'v', '6521', '4503', 'b', 's', 'b', '9651', 'k', '4635', '2195', '7537', '6839', 'i', 'd', 'b', '205', 'q', '7333', 'q', '5129', '4921', 's']

SOLUTION: b, d, f, i, k, q, s, v, w

PROBLEM: ['2329', 'i']

SOLUTION: i

PROBLEM: ['r', '7753', 'r', '7397', '4269', '8917', 'b', '6459', 'z', 'k', '7705', 's', '9893', 'v', '6701', 'g', '9937', 'm', '341', 'a', '3177', '113', 'g']

SOLUTION:
a, b, g, k, m, r, s, v, z