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 java.util.function.*;
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 java.awt.geom.*;
import javax.imageio.*;
import java.math.*;
import java.time.Duration;
import java.lang.invoke.VarHandle;
import java.lang.invoke.MethodHandles;
// assumes that each set function is called exactly once
// (but it doesn't matter which thread you call each of them from.)
class main {

static class LongPairCollector extends AtomicCounter {
  volatile long valueOfA;
  volatile long valueOfB;
  
  final LongConsumer a = __1 -> setA(__1);
  final LongConsumer b = __2 -> setB(__2);

  void setA(long a) { valueOfA = a; itemReceived(); }
  void setB(long b) { valueOfB = b; itemReceived(); }
  
  final LongConsumer setterForA(){ return setA(); }
LongConsumer setA() { return a; }
  final LongConsumer setterForB(){ return setB(); }
LongConsumer setB() { return b; }
  
  void itemReceived() {
    if (incCounter() == 2)
      complete(valueOfA, valueOfB);
  }
  
  // override me
  void complete(long a, long b) {}
}
static class AtomicCounter {
  volatile int counter;
  
  // statically get var handles
  private static final VarHandle vhCounter;
  static { try {
    var l = MethodHandles.lookup();
    vhCounter = l.findVarHandle(AtomicCounter.class, "counter", int.class);
  } catch (Exception __e) { throw rethrow(__e); } }
  
  final int inc(){ return incCounter(); }
int incCounter() {
    return (int) vhCounter.getAndAdd(this, 1)+1;
  }
}


static RuntimeException rethrow(Throwable t) {
  
  if (t instanceof Error)
    _handleError((Error) t);
  
  throw t instanceof RuntimeException ? (RuntimeException) t : new RuntimeException(t);
}

static RuntimeException rethrow(String msg, Throwable t) {
  throw new RuntimeException(msg, t);
}




static void _handleError(Error e) {
  //call(javax(), '_handleError, e);
}



}