program ABC148B
    integer N
    character(100) S,T
    character(200) ans
    read*,N
    read*,S,T
    ans=""
    do i=1,N
        ans(2*i-1:2*i-1)=S(i:i)
        ans(2*i:2*i)=T(i:i)
    end do
    print"(A)",trim(ans)
end program