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 <A, B> void mapPutAll_noOverwrite(Map<A, B> dest, Map<A, B> src) {
  if (dest != null && src != null)
    for (A key : keys( src))
      { B value = src.get(key);  mapPut_noOverwrite(dest, key, value); }
}
static <A, B> Set<A> keys(Map<A, B> map) {
  return map == null ? new HashSet() : map.keySet();
}

static Set keys(Object map) {
  return keys((Map) map);
}








static <A, B> void mapPut_noOverwrite(Map<A, B> map, A key, B value) {
  if (map != null && key != null && value != null
    && !map.containsKey(key))
    map.put(key, value);
}

}