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 boolean isBracket(String s) {
  return isOpeningBracket(s) || isClosingBracket(s);
}
static boolean isOpeningBracket(String s) {
  return eqOneOf(s, "(", "{", "[");
}


static boolean isClosingBracket(String s) {
  return eqOneOf(s, ")", "}", "]");
}




static boolean eqOneOf(Object o, Object... l) {
  for (Object x : l) if (eq(o, x)) return true; return false;
}




static boolean eq(Object a, Object b) {
  return a == b || a != null && b != null && a.equals(b);
}






static String str(Object o) {
  return o == null ? "null" : o.toString();
}

static String str(char[] c) {
  return new String(c);
}



}