import java.util.Scanner;

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

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