题解 | #截取字符串#

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
         Scanner scanner =new Scanner(System.in);
        while (scanner.hasNext()){
            String s = scanner.nextLine();
            Integer n = Integer.valueOf(scanner.nextLine());
            System.out.println(s.substring(0,n));
        }
    }
}