题解 | #截取字符串#

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNext()) { // 注意 while 处理多个 case
            String a = in.next();
            int e = in.nextInt();
            System.out.println(v(a, e));
        }
    }
    //A10;S20;W10;D30;X;A1A;B10A11;;A10;
    private static String v(String str, int end) {
        if (end <= str.length())
            return str.substring(0, end);
        return str;
    }
}