import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main{
    public static void main(String[] args){
        BufferedReader reader=new BufferedReader(new InputStreamReader(System.in));
            try{
            int m=Integer.parseInt(reader.readLine());
            String line=reader.readLine();
            String li="...";
            if(m<line.length()){
                line=line.substring(0, m)+li;
            }
            System.out.println(line);
        }catch (IOException e){    
        }
    }
}
/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