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 sc = new Scanner(System.in);
        while (sc.hasNext()){
            String str = sc.nextLine();
            int n = sc.nextInt();
            System.out.println(str.substring(0,n));
        }
    }
}