The output of following code is $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$

int a$=1,$b$=3$;

int $*$ptr$1,*$ptr$2$;

ptr$1=$&a;

ptr$2=$&b;

$*$ptr$2=3+$ a;

ptr$1=$ptr$2$;

$*$ptr$1=9$;

ptr$2=$&a;

b$=6$;

$*$ptr$2=*$ptr$1+1$;

printf$("\%$d $\%$d $\%$d $\%$d

$",$a$,$ b$,*$ptr$1,*$ptr$2)$;