import java.util.*;

public class StringTokenizerDemo
{
	public static void main (String args[])
	{
		String testString = "a,b,c,d";
		StringTokenizer tokenizer = new StringTokenizer (testString, ",");
		while (tokenizer.hasMoreTokens()) {
			String token = tokenizer.nextToken();
			System.out.println(token);
		}
	}
}