What is the first letter of every sentence, separated by commas?
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:
What is the first letter of every sentence, separated by commas?

### Input:
YouTube has been led by a CEO since its founding in 2005, and has retained this leadership model even after its acquisition by Google. The current CEO is Neal Mohan, who was appointed on February 16, 2023.

### Response:

YouTube has been led by a CEO since its founding in 2005, and has retained this leadership model even after its acquisition by Google. The current CEO is Neal Mohan, who was appointed on February 16, 2023.
Y,T