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