import java.util.*;
public class Main {
    public static void main(String[] args){
        Scanner s = new Scanner(System.in);
        int len = s.nextInt();
        String text = s.next();
        int len0 = text.length();
        if(len0>len){
            text = text.substring(0,len);
            System.out.println(text + "...");
        }else{
            System.out.println(text);
        }
    }
}
/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