Problem:
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.

Sample Input 1

6
abcabc

Sample Output 1

Yes

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

Sample Input 2

6
abcadc

Sample Output 2

No

Sample Input 3

1
z

Sample Output 3

No

Solution in PyPy3 (2.4.0) (judge verdict: Wrong Answer)

N = int(input())
L = list(input())
a = int(N / 2)
if N%2 == 0:
    flag = 0
    for i in range(a):
        print(L[i],L[i+a])
        if L[i] != L[i+a]:
            flag = 1
    if flag:
        print("No")
    else:
        print("Yes")
else:
    print("No")