###
**Problem:**

Given a NxN Matrix(N is odd). Each block contains a letter from A-Z. Find whether matrix is symmetric with respect to central block. Central block for 3x3 matrix is (1,1), index starting from 0.

###
**Input Format:**

N

Next N lines containing content of each row.

Next N lines containing content of each row.

###
**Output Format:**

YES/NO- whether matrix is symetric or not###
**Constraints:**

N is always odd### Sample Input

5

ABFWW

TTTOP

ASDSA

POTTT

WWFBA

ABFWW

TTTOP

ASDSA

POTTT

WWFBA

### Sample Output:

YES### Explanations:

It is symmetric wrt to D(2,2) , example (0,0)=(4,4)=A
Solution:

$str;

for($i=0;$i<$n;$i++)

{

chomp($tmp=<STDIN>);

$str=$str.$tmp;

}

if($str eq reverse($str))

{

print "YES";

}

else

{

print "NO";

}

### Tips:

No need to make N arrays and then compare, use string

I couldn't refrain from commenting. Exceptionally well written!

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