Who are the main cast of It's Always Sunny in Philadelphia?
The main cast of the TV show It's Always Sunny in Philadelphia are Charlie Day, Rob McElhenney, Glenn Howerton, Kaitlin Olson, Danny DeVito, and Mary Elizabeth Ellis.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.
### Instruction: Who are the main cast of It's Always Sunny in Philadelphia?
### Input: 
### Response: The main cast of the TV show It's Always Sunny in Philadelphia are Charlie Day, Rob McElhenney, Glenn Howerton, Kaitlin Olson, Danny DeVito, and Mary Elizabeth Ellis.