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

char*mmap();
#define rd_skip() while(*rp++>=48)

main(){
	char*rp=mmap(0l,1l<<28,1,2,0,0ll);
	rd_skip();
	int a=0;
	do{
		int b=*rp++>49;
		while(*rp++>=48){
			b=1;
		}
		a=!a|b;
	}while(*rp);
	write(1,a?"Alice":"Bob  ",5);
	_exit(0);
}