import java.net.InetAddress;

import java.net.UnknownHostException;

class DnsResolver {

public static void main(String[] args) {

if (args.length != 1) {

System.err.printf("Expected exactly one argument, but got %d%n", args.length);

System.exit(1);

}

String host = args[0];

String[] parts = host.split("\\.");

System.out.printf("The top-level domain of the host %s is %s%n", host, parts[parts.length - 1]);

try {

InetAddress[] ipAddresses = InetAddress.getAllByName(host);

if (ipAddresses.length == 0) {

System.out.printf("The host %s did not resolve to any IP addresses%n", host);

} else {

String pluralSuffix = ipAddresses.length == 1 ? "" : "es";

System.out.printf("The host %s resolved to the following IP address%s:%n", host, pluralSuffix);

}

for (InetAddress ipAddress : ipAddresses) {

System.out.println(ipAddress.getHostAddress());

}

} catch (UnknownHostException e) {

System.err.printf("Failed to resolve %s: %s%n", host, e.getMessage());

System.exit(1);

}

}

}