/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.*;
 
/* 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
	{
		Matcher m = Pattern.compile("additions-(\\d+)\\.txt").matcher("additions-20141230.txt");
		if (m.matches())
		{
		System.out.println(m.group(1));	
		}
		else
		{
			System.out.println("test");
		}
	}
}

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