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 (GCC 5.4.1) (judge verdict: Wrong Answer)

#include<stdio.h>

int main() {
	char S[1000];
	int w;
	int j;
	int max;

	scanf("%s", &S,1000);
	scanf("%d", &w);

	for (j = 0; S[j] != '\0'; ++j);
	max = j;

	printf("%c", S[0]);
	for (int i = 1; i <=max ; i++) {

		if (i % w != 0) {
		}
		else {
			printf("%c", S[i]);
		}
		
	}
	return 0;
}