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 C++14 (GCC 5.4.1) (judge verdict: Accepted)

#include <bits/stdc++.h>
#define lol long long
using namespace std;

//const lol mod=1e9+7;

/*  author: H3XoRuSH  */

int main() {
    ios_base::sync_with_stdio(false);
    ios::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    string s;
    lol a;
    cin >> s >> a;
    lol i=0;
    while(i<s.length()){
        cout << s[i];
        i+=a;
    }
    return 0;
}