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 isBracketPair(String opening, String closing) {
  return checkMapValue(generalMapOfOpeningToClosingBrackets(), opening, closing);
}
static <A, B> boolean checkMapValue(Map<A, B> map, A key, B value) {
  return map != null && eq(map.get(key), value);
}
static Map<String, String> generalMapOfOpeningToClosingBrackets_cache;
static Map<String, String> generalMapOfOpeningToClosingBrackets() { if (generalMapOfOpeningToClosingBrackets_cache == null) generalMapOfOpeningToClosingBrackets_cache = generalMapOfOpeningToClosingBrackets_load(); return generalMapOfOpeningToClosingBrackets_cache; }

static Map<String, String> generalMapOfOpeningToClosingBrackets_load() {
  return litmap("(" , ")", "{" , "}", "<" , ">", "[" , "]");
}



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


static HashMap litmap(Object... x) {
  HashMap map = new HashMap();
  litmap_impl(map, x);
  return map;
}

static void litmap_impl(Map map, Object... x) {
  if (x != null) for (int i = 0; i < x.length-1; i += 2)
    if (x[i+1] != null)
      map.put(x[i], x[i+1]);
}


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

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

}