public class Two { 
  public static void main(String[] args) {
    String number = args[0]; 
    if (number.equals("bye")) {

    } else {
      try { 
        double value = Double.parseDouble( number ); 
        System.out.println( Math.sqrt( value ) ); 
      } catch (Exception e) {
        System.out.println( number + " is not a number."); 
      }
    } 
  }
}