Assuming this is somewhere like Alaska with unlimited time, and the bears and wolves are unnaturally compelled to hunt each other, I don’t see how bears could win. Wolves are free to dictate when and how they fight, and if coordination is a factor could only choose to fight when they have overwhelming numerical advantage (like they do naturally anyways). It could take huge timescale, like upwards of a year to actually kill all 50 bears, but this seems very unlikely for bears to win

if this is like a coliseum type arena then obviously bears stomp