String First Last N Chars

Background

Dawei is studying string processing and encountered an interesting problem.

Problem Description

Given a string $s$ and an integer $n$, return a new string made of the first $n$ characters and the last $n$ characters from the original string. The string length will be at least $n$.

Input Format

Input is given from standard input in the following format.

A string $s$. An integer $n$.

Output Format

Output is printed to standard output in the following format.

A new string, formed by concatenating the first $n$ characters and the last $n$ characters of the original string.

Sample

Hello
2

Helo

Chocolate
3

Choate

Chocolate
1

Ce

Sample Explanation

For the first sample, the first 2 characters of "Hello" are "He\