package SixPrograms;
import java.util.*;
public class recursiveString {
	static Scanner scan=new Scanner(System.in);
	public static void main(String[]args) {
		String word=scan.next();
		int a=scan.nextInt();
		System.out.println(method(word,a));
	}
	public static String method(String word,int a) {
		if(a==0)
			return "";
		return word.substring(0,a)+method(word,a-1);
	}
}