Rikishi's flags

When I just went Nagoya,Sumo tournament has taken in Nagoya.
The picture is Sumo Rikishi's（Sumo wrestlers）flags.
Today, Sumo Rikishi has been coming from overseas too.
For example,Mongolia,Bulgaria,Estonia etc.
If I had had enough time, I could have enjoyed Sumo match in Nagoya....(T_T)