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

#define rd_skip() while(*rp++>=48)
#define rd() ({long _v=0,_c;while(_c=*rp++-48,_c>=0)_v=_v*10+_c;_v;})

int main(){
	char*mmap();
	char*rp=mmap(0l,1l<<25,1,2,0,0ll);
	rd_skip();
	long x=0;
	while(*rp){
		rd_skip();
		if(*rp){
			x^=rd();
		}
	}
	write(1,x?"Alice":"Bob  ",5);
	_exit(0);
}