Problem:
Score : 200 points

Problem Statement

You are given a string S consisting of lowercase English letters.
We will write down this string, starting a new line after every w letters. Print the string obtained by concatenating the letters at the beginnings of these lines from top to bottom.

Constraints

1 \leq w \leq |S| \leq 1000

S consists of lowercase English letters.

w is an integer.

Input

Input is given from Standard Input in the following format:

S
w

Output

Print the desired string in one line.

Sample Input 1

abcdefgh
3

Sample Output 1

adg

When we write down abcdefgh, starting a new line after every three letters, we get the following:

abc

def

gh

Concatenating the letters at the beginnings of these lines, we obtain adg.

Sample Input 2

lllll
1

Sample Output 2

lllll

Sample Input 3

souuundhound
2

Sample Output 3

suudon

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)


import java.util.*;
public class Main{
    public static void main(String[] args)throws Exception{
        Scanner sc = new Scanner(System.in);

        String s = sc.nextLine();
        int n = sc.nextInt();
        int m = s.length();


        for(int i = 0;i < m;i++){//i=0,1,2,,,,n-1 で動作
            if(i%n == 0)
                System.out.print(s.charAt(i));
        }



//        System.out.println(ans);
    }
}