#pragma GCC optimize("Ofast")
#pragma GCC target("avx2")

#define rd_init() char*rp=({char*mmap();mmap(0l,1l<<25,1,2,0,0ll);})

int main(){
	rd_init();
	rp=index(rp,32);
	int a=rp[-1];
	rp=index(rp,10);
	int b=rp[-1];
	if(a+b&1){
		write(1,"Impossible",10);
	}else{
		write(1,"Possible",8);
	}
	_exit(0);
}