In HDU, there is an little world created by GL, WYB, and CTW. This world lives some birds which are recognized as firebirds. Actually, the firebirds' world exists three kind of birds, respectively created by GL, WYB, CTW. So I will call them "Gbird", "Wbird", "Cbird" below.
What's more, these birds can talk to ACMers and have their own habit as follows:
Gbird are like GL, never tell truth. Wbird like to tell the truth in the day, but lie in the night. While Cbird are all honest, and never lie.
Now, some firebirds talk to you and tell you some statements, can you deduce what kind of these birds are, and whether it's day or night?