题解 | #截取字符串#

import java.util.*;

public class Main{
    public static void main(String args[]){
        Scanner sc = new Scanner(System.in);
        while(sc.hasNext()){
            String str = sc.next();
            int n = sc.nextInt();
            String st = str.substring(0,n);
            System.out.println(st);
        }
    }
}