/* package whatever; // don't place package name! */
 
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
{
	public static void main (String[] args) throws java.lang.Exception
	{
		ArrayList<String> list = new ArrayList<String>();
		list.add("one");
		list.add("two");
		list.add("three");
 
		String listString = "";
 
		for (int i=0;i<list.size()-1;i++)
    		listString += list.get(i) + ",";
 
		System.out.println(listString+list.get(list.size()-1));
	}
}

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