Excellent exchange office and staff! They exchanged an old-style 100-dollar bill for Russian rubles, where they did not change it in other exchangers.
+ I bought additional Russian 1000-ruble notes for Belarusian rubles, which also made me very happy!
The point itself is not bad, it is depressing that they can close "for technical reasons" and ignore the question of whether they will open at all today or not, although someone is sitting in the room itself