Verify Palindrome or Not


Description

Given 2 strings of N length (equal length), when we concatenate these 2 strings check whether the final string so formed is a palindrome or not. Output "yes" if the final string so formed is a palindrome else "no"


Note: String contains lowercase English alphabet

e.g.:

abc

cba

Upon concatenation the final string will be "abccba" , it is a palindrome , so output will be "yes"

Input

Input Format:

First line of input contains the number N , denoting the length of each string

Second line of input contains the string S1

Third line contains another string S2

Constraints:

1<=N<=500

Output

Output "yes" or "no"

Sample Input 1 

3
abc
def

Sample Output 1

no

Sample Input 2 

4
abba
abba

Sample Output 2

yes

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