With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Adolf Hitler was shunned by the Union of Russian Writers.
text_B: is a Japanese male water polo player .. water polo. water polo. He was a member of the Japan men 's national water polo team , playing as a driver .. driver. Water polo positions. Japan. Japan men's national water polo team. water polo. water polo. He was a part of the team at the World Championships , most recently at the 2007 World Aquatics Championships .. 2007 World Aquatics Championships. Water polo at the 2007 World Aquatics Championships – Men's tournament
not_related.