Tell me whether these people are chess Grandmasters or professional boxers: Nikolai Krogius, Evgeny Gleizerov, Dmitry Bivol, Nikolai Valuev, and Alexander Alekhine.
Nikolai Krogius, Evgeny Gleizerov and Alexander Alekhine are chess Grandmasters. Instead, Dmitry Bivol and Nikolai Valuev are professional boxers.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.
### Instruction: Tell me whether these people are chess Grandmasters or professional boxers: Nikolai Krogius, Evgeny Gleizerov, Dmitry Bivol, Nikolai Valuev, and Alexander Alekhine.
### Input: 
### Response: Nikolai Krogius, Evgeny Gleizerov and Alexander Alekhine are chess Grandmasters. Instead, Dmitry Bivol and Nikolai Valuev are professional boxers.