package com.javarush.task.task18.task1825;

import java.io.*;
import java.util.Comparator;
import java.util.Set;
import java.util.TreeSet;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/*
Собираем файл
*/

public class Solution {
    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        Set<String> fileNameSet = new TreeSet<>();
        BufferedOutputStream buffOut = null;

        Pattern pattern = Pattern.compile("(.*)\\.(part\\d+)");
        Matcher matcher;

        while (true) {
            String fileName = reader.readLine();
            if (fileName.equals("end")) {
                reader.close();
                break;
            }

            fileNameSet.add(fileName);

            if (buffOut == null) {
                matcher = pattern.matcher(fileName);
                if (matcher.find()) {
                    buffOut = new BufferedOutputStream(new FileOutputStream(matcher.group(1)));
                }
            }
        }

        BufferedInputStream buffIn;

        for (String fileName : fileNameSet) {
            buffIn = new BufferedInputStream(new FileInputStream(fileName));
            while (buffIn.available() > 0) {
                buffOut.write(buffIn.read());
            }

            buffIn.close();
        }

        buffOut.close();
    }
}