View Code of Problem 22

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Scanner;
 
 
 
public class Main {
	public static void main(String[] args)  {
		Scanner scanner = new Scanner(System.in);
		while(scanner.hasNext()) {
			String s1 = scanner.next();
			String s2 = scanner.next();
			char[] c1 = s1.toCharArray();
			char[] c2 = s2.toCharArray();
			List<Character> list = new ArrayList<>();
			for(int i=0; i<c2.length;i++) {
				for(int j=0; j<c1.length; j++) {
					if(c2[i] == c1[j]) {
						c1[j] = '0';
						list.add(c2[i]);
						break;
					}
				}
			}
			Collections.sort(list);
			for(Character c: list) {
				System.out.print(c);
			}
			System.out.println();
		}
	}
 

}