public static void main(String[] args) {
		String s;
		s = "foo";
        for(int i=0;i<10;i+=1){
            s+=Integer.toString(i);
        }
        
        System.out.println(s);
        

		// TODO Auto-generated method stub
		//System.out.println(rec(0, 5));
		//System.out.println(rec_v2(0, 5));
	}