line = readlines
len = line.length
i = 0

while i < len
    line[i] = line[i].chomp.split(' ')
    i += 1
end


num = line[0]
words = line[1]
newWord = ""

w1 = words[0]
strW1 = w1.split(//)
w2 = words[1]
strW2 = w2.split(//)

i = 0
strW1.each do |word| 
  newWord += strW1[i]
  newWord += strW2[i]
  i += 1
end

print newWord