public static void main(String args[]){
        String s="aaaaaa";
        StringBuilder aa=new StringBuilder(s);
        //long startTime=System.currentTimeMillis();
        for(long i=0;i<1000;i++){
            aa.append(i);
        }
        //long lengTime=System.currentTimeMillis();
        //long time=lengTime-startTime;
        System.out.println(aa);
        //System.out.println(time);
        
        
        }