import java.util.*;

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