import java.util.*;

public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int K = Integer.parseInt(sc.next());
    String S = sc.next();
    if(S.length() <= K)
      System.out.println(S);
    else
      System.out.println(S.substring(0,K) + "...");
  }
} import java.util.*; util.* java public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int K = Integer.parseInt(sc.next());
    String S = sc.next();
    if(S.length() <= K)
      System.out.println(S);
    else
      System.out.println(S.substring(0,K) + "...");
  }
} Main public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int K = Integer.parseInt(sc.next());
    String S = sc.next();
    if(S.length() <= K)
      System.out.println(S);
    else
      System.out.println(S.substring(0,K) + "...");
  } main {
    Scanner sc = new Scanner(System.in);
    int K = Integer.parseInt(sc.next());
    String S = sc.next();
    if(S.length() <= K)
      System.out.println(S);
    else
      System.out.println(S.substring(0,K) + "...");
  } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int K = Integer.parseInt(sc.next()); K Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc String S = sc.next(); S sc.next() sc.next sc if(S.length() <= K)
      System.out.println(S);
    else
      System.out.println(S.substring(0,K) + "..."); S.length() <= K S.length() S.length S K System.out.println(S) System.out.println System.out System System.out S System.out.println(S.substring(0,K) + "...") System.out.println System.out System System.out S.substring(0,K) + "..." S.substring(0,K) S.substring S 0 K "..." String[] args args public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int K = Integer.parseInt(sc.next());
    String S = sc.next();
    if(S.length() <= K)
      System.out.println(S);
    else
      System.out.println(S.substring(0,K) + "...");
  }
} public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int K = Integer.parseInt(sc.next());
    String S = sc.next();
    if(S.length() <= K)
      System.out.println(S);
    else
      System.out.println(S.substring(0,K) + "...");
  }
} Main
import java.util.*;

public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int K = Integer.parseInt(sc.next());
    String S = sc.next();
    if(S.length() <= K)
      System.out.println(S);
    else
      System.out.println(S.substring(0,K) + "...");
  }
}