import java.io.*;
import java.util.Scanner;


public class Part2Test
{
  public static void main(String[] args)throws InvalidStringException, IOException {

    File file = new File("test.txt");
    Scanner input = new Scanner(file);

    String regEx = ".*\\d+.*";
    String process;

    while(input.hasNext()){
      try {
        process = input.next();

        if(process.matches(regEx))
          throw new InvalidStringException(process, "Invalid Character Found!");

        if(process.length() > 20)
          throw new InvalidStringException(process, "Invalid! String excedes 20 characters", process.length());
      } //end try
      catch(Exception e) {
        System.out.println(e.getMessage());
      }//end catch

    }//end while
    input.close();
  }
}










////////////////////////////////////////////////////////////////////////////////////


public class InvalidStringException
                                extends Exception {

  public InvalidStringException(String input, String err) {
    super(err);
  }

  public InvalidStringException(String input, String err, int size) {
    super(err);
    if(size > 20)
      throw new IllegalArgumentException();
  }

}//end class