Problem:
Score : 200 points

Problem Statement

Given are strings s and t of length N each, both consisting of lowercase English letters.

Let us form a new string by alternating the characters of S and the characters of T, as follows: the first character of S, the first character of T, the second character of S, the second character of T, ..., the N-th character of S, the N-th character of T. Print this new string.

Constraints

1 \leq N \leq 100

|S| = |T| = N

S and T are strings consisting of lowercase English letters.

Input

Input is given from Standard Input in the following format:

N
S T

Output

Print the string formed.

Sample Input 1

2
ip cc

Sample Output 1

icpc

Sample Input 2

8
hmhmnknk uuuuuuuu

Sample Output 2

humuhumunukunuku

Sample Input 3

5
aaaaa aaaaa

Sample Output 3

aaaaaaaaaa

Solution in Perl (v5.18.2) (judge verdict: Wrong Answer)

my $n = <STDIN>;
my $s = <STDIN>;
my @s = split(/ /,$s);
@a = split(/ /,$s[0]);
@b = split(/ /,$s[1]);

#print "$a $b\n";
for($i= 0;$i<$n;$i++){
  print "$a[$i]$b[$i]";
}