import java.util.*;
public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int count = sc.nextInt();
      	String line = sc.next();
      	String[] mozi = line.split("");
      	String output = "";

      	if (mozi.length > count){
          	for(int i=0; i<count; i++){
          		output += mozi[i];
        	}
			output += "...";
        }else{
            for(int i=0; i<mozi.length; i++){
          		output += mozi[i];
        	}
        }
        System.out.println(output);
    }

}
/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