Input
house
Your output
None
Expected output
house giher glues glued gluer joyed bouse boyar boyer boise bluer bliss


Input
abc
Your output
None
Expected output
abv

Input
elephant
Your output
None
Expected output
elephant

Input
warm
Your output
None
Expected output
sark


Input
blue
Your output
None
Expected output
blue bouw bour boyd bois hoys hohe

blahblah
Your output
None

Input
screen
Your output
None
Expected output
screen extern

Input
fun
Your output
None
Expected output
fun fum dyn run rub rhb rin rib rim gun gum gym gin cuj chn chm