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.

-----Sample Input-----
6
abcabc

-----Sample Output-----
Yes

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

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