Masters Tournament- - Acrostic

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.

Examples

Input

abcdefgh 3

Output

adg

Input

lllll 1

Output

lllll

Input

souuundhound 2

Output

suudon

inputFormat

Input

Input is given from Standard Input in the following format:

S w

outputFormat

Output

Print the desired string in one line.

Examples

Input

abcdefgh 3

Output

adg

Input

lllll 1

Output

lllll

Input

souuundhound 2

Output

suudon

样例

lllll
1

lllll