#!/usr/bin/perl -l $_=pop;chop while print,s}.(?=(.))}$%=$&+$+and$%%9||9}ge
#!/usr/bin/perl -l $_=pop;chop while s}.}$`||print;$%=$&+($'&'?')and$%%9||9}ge
#!/usr/bin/perl -l $_=pop;{print;s;.;$==$&+($'&'?')and$=%9||9;ge;chop;$_&&redo}