B - Echo

Score : $200$ points

Problem Statement

Given are a positive integer $N$ and a string $S$ of length $N$ consisting of lowercase English letters.

Determine whether the string is a concatenation of two copies of some string. That is, determine whether there is a string $T$ such that $S = T + T$.

Constraints

• $1 \leq N \leq 100$
• $S$ consists of lowercase English letters.
• $|S| = N$

Input

Input is given from Standard Input in the following format:

$N$

$S$

Output

If $S$ is a concatenation of two copies of some string, print Yes; otherwise, print No.

6
abcabc

Yes

Let $T = $ abc, and $S = T + T$.

6
abcadc

No

1
z

No