Broken KeyBoard

import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Scanner;
//Broken KeyBoard
public class Main_081 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        while (scanner.hasNext()) {
            String good = scanner.nextLine();
            String broke = scanner.nextLine();

            String[] g = good.toUpperCase().split("");
            String[] b = broke.toUpperCase().split("");

            Map<String,Integer> map = new LinkedHashMap<>();
            int j = 0;
            for (int i = 0; i < g.length; i++) {
                if (j < b.length && g[i].equals(b[j])) {
                  j++;
                } else {
                    map.put(g[i], 0);
                }
            }
            for (String key : map.keySet()) {
                System.out.print(key);
            }
        }
    }
}