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 Ruby (2.3.3) (judge verdict: Accepted)

str_len = gets.to_i
st_array = gets.strip.split(" ").map{|i| i.to_s}
i = 0
j = 0

new_len = str_len * 2

ans =  Array.new(new_len)

while i < str_len
   ans[j] = st_array[0][i]
   ans[j + 1] = st_array[1][i]
   
   i += 1
   j += 2
end

ans.each do |i|
   print i
end