interface ccc()
{
  void c(int p);
  {
  }
}

class sss implements ccc
{
  public void c(int p)
  {
    System.out.println(p*p);
  }
}

class fff
{
  public static void main(String args[])
  {
    ccc s = new ccc();
    sss a = new sss();
    s.c(5);
    
    s = a;
    s.c(5);
  }
}