/* package whatever; // don't place package name! */
 
import java.util.concurrent.ConcurrentHashMap;
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	private Map<String, String> m;
	public Ideone(){
		synchronized(this){
			m = new ConcurrentHashMap<>();
		}
	}
 
	public synchronized Map<String, String> getM(){
		return m;
	}
 
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
	}
}

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