import java.util.*;
public class Main{
    public static void main(String[] args){
        Scanner input=new Scanner(System.in);
        int k=input.nextInt();
        String N=input.next();
        int n=N.length();
      if(n<=k){
      System.out.print(N);
      }else{
        System.out.print(N.substring(0,k)+"...");
      }
    }   
}
/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