/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Main {
	public static void main(String[] args) {
		Map<String,String> map = new LinkedHashMap();
		map.put("1","a");
		map.put("3","c");
		map.put("2","b");
		map.put("0","d");
		System.out.println(map.values());
		System.out.println(map.keySet());
	}
}

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