void main(){
  import std.stdio, std.string, std.conv, std.algorithm;

  int n; rd(n);
  long[4] cnt;
  foreach(_; 0..n){
    int x, y; rd(x, y);
    if((x&1)&&(y&1)) cnt[0]++;
    else if(x&1) cnt[1]++;
    else if(y&1) cnt[2]++;
    else cnt[3]++;
  }

  auto sum=reduce!((r, e)=>r+e/2)(0L, cnt);
  if(sum&1) writeln("Alice");
  else writeln("Bob");
}

void rd(T...)(ref T x){
  import std.stdio, std.string, std.conv;
  auto l=readln.split;
  assert(l.length==x.length);
  foreach(i, ref e; x){
    e=l[i].to!(typeof(e));
  }
}