class Revuelto {
  public static void main(String [] args) {
     int x=3;
     while (x>0) {
        if (x>2) {
          System.out.print("a");
        }

        x=x-1;
        System.out.print("-");
        if (x==2) {
          System.out.print("b c");
        }

        if (x==1) {
          System.out.print("d");
          x=x-1;
        }

       
        

  
     }

  }

}