import java.util.*;
// 7
// nikoandsolstice
public class Main {
    public static void main(String args[]) {
        
        Scanner sc = new Scanner(System.in);
       int t = sc.nextInt();
       String s = sc.next();
       String f = "";
       int length = s.length();
       
       for(int i = 0;i<t&& i<s.length();i++){
          f+= s.charAt(i); 
       }
    
  
   if(length>t){
       System.out.print(f+"...");
   }else
   System.out.print(f);
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz