When I looked at the list of registered users per round 639 div 1 I found an interesting thing: people with a rating of less than 1900 can register for it. MikeMirzayanov please fix it

We are worried about racist tasks on Codeforces. We hope that the authors will apologize to all of Latin America community on Codeforces.

MikeMirzayanov please control who does what on Codeforces. We hope that it will never happen on Codeforces again.