$n=<>;
@a=<>;
@r=0..$n-1;
hoge:for(0..9999){
	@r=sort{.5<=>rand}@r;
	for$j(0..$n-1){
		$a[$j]!=$r[$j] or next hoge;
	}
	for$j(0..$n-1){
		print$r[$j],$/;
	}
	exit;
}
print -1;