import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String regex = "-a-([^\\?]+)\\?";
        String string = "location/city/home-a-berlin?/someNewAdress\n";
 
        Pattern pattern = Pattern.compile(regex);
        Matcher matcher = pattern.matcher(string);
 
        if (matcher.find()) {
            System.out.println(matcher.group(1));
        }
	}
}

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