A female star was killed, and the police caught two suspects, but they were not sure which of them was the murderer. So the police launched an investigation and found that the female star liked collecting shoes very much before her death. After her shoe box was turned upside down, the murderer put it away. The police found that she had 80 pairs of shoes, 20 pairs of red and green shoes in the red box and 20 pairs of red and green shoes in the green box. These shoes are neatly arranged. The police asked two suspects, which one of you is red and green color blind, and A said, "B is red and green color blind." Clever, can you guess that please is the murderer?