Find out who the president of the United States is.
As an AI language model, I don't have access to current events or real-time information, so my response is based on the date I was last trained. As of September 2021, the president of the United States is Joe Biden.
Complete the following task based on the instruction and optional input provided.### Instruction:
Find out who the president of the United States is.

### Output:
As an AI language model, I don't have access to current events or real-time information, so my response is based on the date I was last trained. As of September 2021, the president of the United States is Joe Biden.