import java.util.*; 
class Main 
{
public static void main(String args[]) 
{
Scanner sc = new Scanner(System.in); 
int n = Integer.parseInt(sc.nextLine()); 
String s = sc.nextLine(); 
int l= s.length(); 
if(l<=n) 
{
System.out.print(s);
} 
else 
{ 
System.out.print((s.substring(0,n))+"...");    
}
} 
}
/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