Common interest tags

You are given a and b, the interest tag lists of two people. Complete the function solution, which returns a list of the tags that both people have, sorted in ascending order, the way sorted() sorts strings.

Even if the same tag appears several times in one person's list, include it only once.

Function

solution(a, b)

Constraints

• The lengths of a and b are each from 1 to 100,000.
• Each tag is a string of lowercase English letters and digits, with a length from 1 to 10.

Examples

Starter code

def solution(a, b):
    answer = []
    return answer