/******************************************************************************
 * This program copies the first few and last few lines of stdin to stdout
 * 
 * Copyright © 2020 Richard Lesh.  All rights reserved.
 *****************************************************************************/

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import org.pureprogrammer.Utils;

public class HeadAndTail {

    public static void main(String[] args) {
        int maxLines = 10;
        if (args.length == 1) {
            maxLines = Utils.stoiWithDefault(args[0], 10);
        }

        List<String> buffer = new ArrayList<>(Collections.nCopies(maxLines, null));
        String line;
        int count = 0;
        while ((line = Utils.getline()) != null) {
            buffer.set(count % maxLines, line);
            if (count < maxLines) {
                System.out.println(line);
            }
            ++count;
        }
        if (count > maxLines && count <= 2 * maxLines) {
            final int REMAINING = count - maxLines;
            for (int i = 0; i < REMAINING; ++i) {
                System.out.println(buffer.get(i));
            }
        } else if (count > 2 * maxLines) {
            System.out.println("...");
            for (int i = 0; i < maxLines; ++i) {
                System.out.println(buffer.get((count + i) % maxLines));
            }
        }
    }
}