#!/usr/bin/perl -l $_=shift;print,s/.(?=(.))/$1+$&-($1+$&>9)*9/ge,chop while/./ |
#!/usr/bin/perl -l $_=shift;print,s/.(?=(.))/$&+$1&&($&.$1-1)%9+1/ge,chop while/./ |
#!/usr/bin/perl -l print$_=shift;chop,print while s/.(?=(.))/$&+$1&&($&.$1-1)%9+1/ge |
#!/usr/bin/perl -l print$_=shift;chop,print while s/.(?=(.))/$&+$1>9?$&+$1-9:$&+$1/ge |
#!/usr/bin/perl -l print$_=shift;chop,print while s/(.)(?=(.))/$1+$2>9?$1+$2-9:$1+$2/ge |
#!/usr/bin/perl -l print$_=shift;s/.$//,print while s/(.)(?=(.))/$1+$2>9?$1+$2-9:$1+$2/ge |