Who won the 2017 Oscars for Best Actor?
Casey Affleck won the 2017 Oscar for Best Actor for his role in "Manchester by the Sea."
Complete the following task based on the instruction and optional input provided.### Instruction:
Who won the 2017 Oscars for Best Actor?

### Output:
Casey Affleck won the 2017 Oscar for Best Actor for his role in "Manchester by the Sea."