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
