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 in = new Scanner(System.in);
        while(in.hasNextLine()){
            String str = in.nextLine();
            int len = Integer.parseInt(in.nextLine());
            String resStr = str.substring(0,len);
            System.out.println(resStr);
        }
    }
}