i
;f
(char*s
){for(;putchar(*s
);)i
=s
[i
]^s
[1]||!s
++;} 
 
int main( void )
{
    f( "aabbcccc" ) ;
    f( "doorbell" ) ;
    f( "uuuuuuuuuz" ) ;
    f( "q" ) ;
    f( "xyxyxy" ) ;
    f( "xxxyyy" ) ;
}
				Cmk7ZihjaGFyKnMpe2Zvcig7cHV0Y2hhcigqcyk7KWk9c1tpXV5zWzFdfHwhcysrO30KCgppbnQgbWFpbiggdm9pZCApCnsKICAgIGYoICJhYWJiY2NjYyIgKSA7CiAgICBwdXRzKCAiIiApIDsKICAgIGYoICJkb29yYmVsbCIgKSA7CiAgICBwdXRzKCAiIiApIDsKICAgIGYoICJ1dXV1dXV1dXV6IiApIDsKICAgIHB1dHMoICIiICkgOwogICAgZiggInEiICkgOwogICAgcHV0cyggIiIgKSA7CiAgICBmKCAieHl4eXh5IiApIDsKICAgIHB1dHMoICIiICkgOwogICAgZiggInh4eHl5eSIgKSA7Cn0=