def a(n, a_st, b_st)
  result = ""
  a_set = a_st.split('')
  b_set = b_st.split('')
  for a in 0..a_set.size-1
    result = result+a_set[a]
    result = result+b_set[a]
  end
  return result
end

n = gets.chop.split.map(&:to_i)
a_st, b_st = gets.chop.split

print a(n, a_st, b_st)