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" ) ;
}
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