import java.util.*; import java.util.zip.*; import java.util.List; import java.util.regex.*; import java.util.concurrent.*; import java.util.concurrent.atomic.*; import java.util.concurrent.locks.*; import javax.swing.*; import javax.swing.event.*; import javax.swing.text.*; import javax.swing.table.*; import java.io.*; import java.net.*; import java.lang.reflect.*; import java.lang.ref.*; import java.lang.management.*; import java.security.*; import java.security.spec.*; import java.awt.*; import java.awt.event.*; import java.awt.image.*; import javax.imageio.*; import java.math.*; class main { static String toStringWithIdentityHashCode(Object o) { return withIdentityHash(o, str(o)); } static String withIdentityHash(Object o, String s) { return o == null ? s : addSuffix(s, "@" + intToHex_flexLength(identityHashCode(o))); } static String str(Object o) { return o == null ? "null" : o.toString(); } static String str(char[] c) { return new String(c); } static String addSuffix(String s, String suffix) { return s == null || s.endsWith(suffix) ? s : s + suffix; } static String intToHex_flexLength(int i) { return Integer.toHexString(i); } static int identityHashCode(Object o) { return System.identityHashCode(o); } }