Untitled

 public static List<String> missingWords(String s,String t)
    {
        String[] ss=s.split(" ");
        String[] ts=t.split(" ");
        int m=ts.length;
        int ind=0;
        
        List<String> ans=new ArrayList<>();
        for(String w:ss)
        {
            if(ind==m || !ts[ind].equals(w))
            ans.add(w);
            else
            ind++;
        }
        return ans;
    }