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);
        String str = "";
        int k = 0;
        while (in.hasNext()) {

            str = in.next();
            k = in.nextInt();
            if (str.length() > k) {
                System.out.println(str.substring(0, k));
            } else {
                System.out.println(str);
            }
        }
    }
}