#
# ####
 #    #
# ####
#

a
b cdef
 g    h
i jklm
n
o
p qrst
 u    v
w xyz.
.

1| a  <-3
 V b cdef
    g    h
4| i jklm
 V n  2->
  ...

I: "abcdefghijklmnopqrstuvwxyz"
O: "abgjklmhfedcginopuxyz vtsrquw "

I: "!@#"
O: "!@         #   "

I: ""
O: ""

I: "12345 67890"
O: "12690  7 54368 "

I: " "
O: "               "