import java.util.*;
public class Main{
    public static void main(String args[]) {
    Scanner obj = new Scanner(System.in);   
    int i;
    int n=obj.nextInt();
    String s=obj.next();
   	String str="";
   	char a[]=s.toCharArray();
    for(i=0;i<s.length();i++)
    {
        if(i==n)
        {
            str=str+"...";
            break;
        }
        else
        {
            str=str+s.charAt(i);
        }
    }
    System.out.print(str);
    
}
}
/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