//Sample12_03.java
class Sample12_03{
  static int no=1;
  public static void main(String[] args){

    if(no<10){
    	String str = "";
    	for(int i=0;i<no;i++){
          str += (i+1);
    	}
    	System.out.println(str);
    	no++;
    	main(null);
    }else{
    	System.out.println("end: " + no);
    }
  }
}