import java.util.Scanner;
public class Main{
    public static void main(String[] args){
        Scanner scanner = new Scanner(System.in);
        
        int a = scanner.nextInt();
        String str = scanner.next();
        int valLen = str.length(); 
        if(valLen == a){
            System.out.println(str);
        }else if(valLen < a){
            System.out.println(str);
        }else{
            String i = str.substring(0,a);
            System.out.println(i + "...");
        }
    }
}
/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