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.*;
class main {

static void showDirChooser(File defaultDir, IVF1<File> action) { showDirChooser(null, defaultDir, action); }
static void showDirChooser(Component parent, File defaultDir, IVF1<File> action) {
  JFileChooser fileChooser = new JFileChooser(defaultDir);
  fileChooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
  fileChooser.setAcceptAllFileFilterUsed(false);

  if (fileChooser.showOpenDialog(parent) == JFileChooser.APPROVE_OPTION)
    { if (action != null) action.get(fileChooser.getSelectedFile()); }
}
static interface IVF1<A> {
  void get(A a);
}

}