import java.util.Scanner;

              public class VowelChecker7078 {
              
                  public static void main(String[] args) {
                      Scanner scanner = new Scanner(System.in);
              
                      System.out.print("Enter a string: ");
                      String input = scanner.nextLine();
              
                      try {
                          checkForVowels(input);
                          System.out.println("The string contains vowels.");
                      } catch (NoVowelsException e) {
                          System.err.println("Error: " + e.getMessage());
                          e.printStackTrace();
                      }
              
                      scanner.close();
                  }
              
                  public static void checkForVowels(String str) throws NoVowelsException {
                      if (!str.matches(".*[aeiouAEIOU].*")) {
                          throw new NoVowelsException("No vowels found in the string.");
                      }
                  }
              }
              
              class NoVowelsException extends Exception {
                  public NoVowelsException(String message) {
                      super(message);
                  }
              }