In the face of such a difficult problem, people can't help but feel confused all of a sudden. The problem seems simple, but to really guess, it's not so easy!

Chu Fei looks at everyone and doesn't answer. He can't help but say generously, "guess it, I'll give you a chance, OK?"

"I think it may be white, right?" Cao song was the first to guess.

"no, next!" Shaking his head, chufei said.

"it's black, isn't it?" On behalf of the five venomous monsters, the green snake said its answer.

"no, next!" Chufei continued to shake his head.

"ha ha, that must be gray!" Hickory guessed with confidence.

Unfortunately, he...