View Code of Problem 22

import java.util.ArrayList;
import java.util.Collections;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner scanner =new Scanner(System.in);
		while(scanner.hasNext()) {
			String a=scanner.nextLine();
			String b=scanner.nextLine();
			char[] ac=a.toCharArray();
			char[] bc=b.toCharArray();
			ArrayList<Character> clist=new ArrayList<>();
			for(int i=0;i<ac.length;i++) {
				for(int j=0;j<bc.length;j++) {
					if(ac[i]==bc[j]) {
						clist.add(ac[i]);	
						bc[j]='0';
						break;
					}
				}
			}
			
			Collections.sort(clist);
			for(int i=0;i<clist.size();i++) {
				System.out.print(clist.get(i));
			}
			System.out.println();
		}
	}

}