Two string - java - HashSet, Set, Character, String class

Twostring5.java

import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {
    private static boolean solve(String a, String b) {
        Set<Character> set = new HashSet<Character>();
        for (int i = 0; i < a.length(); i++) {
            set.add(a.charAt(i));
        }
        for (int i = 0; i < b.length(); i++) {
            if (set.contains(b.charAt(i))) return true;
        }
        return false;
    }
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int T = in.nextInt(); in.nextLine();
        for (; T > 0; T--) {
            System.out.println(solve(in.nextLine(), in.nextLine()) ? "YES" : "NO");
        }
    }
}