module kkk
  sub aa ()
    dim n as integer
    dim s as string, t as string
    dim i as integer
    dim ans as string
    
    n = console.readline()
    s = console.readline()
    t = console.readline()
    
    for i = 1 to n
    	ans = ans & left(s,i) & left(t,i)
  next
  
  console.writeline(ans)
  
end sub
end module
  
    