import java.util.*;
class Main
{
    public static void main(String args[])
    {
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        sc.nextLine();
        String s=sc.nextLine();
        int l=s.length();
        String k="";
        if(l<=n)
        System.out.println(s);
        
        else
        {
            for(int i=0;i<n;i++)
            {
                k=k+s.charAt(i);
            }
            k=k+"...";
            System.out.println(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