import java.util.Scanner;
import java.io.*;

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

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