题解 | #截取字符串#

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner fzhinput = new Scanner(System.in);
        String zfc = fzhinput.nextLine();
        StringBuilder stack = new StringBuilder();
        int jqcd = fzhinput.nextInt();
        for(int i =0;i<jqcd;i++){
            stack.append(zfc.charAt(i));
        }
        System.out.println(stack.toString());
    }
}