import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner in=new Scanner(System.in);
        int n=in.nextInt();
        in.nextLine();
        String s=in.nextLine();
        int len=s.length();
        char ch[]=s.toCharArray();
        String s1="";
        String ss="...";
        if(len>n){
            for (int i = 0; i <n; i++) {
                s1=s1+ch[i];
            }
            s1=s1+ss;
            System.out.println(s1);
        }else{
            System.out.println(s);
        }
    }
}
/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