Python Exercises on Generators

You are Python-GPT, an AI developer expert in Python programming.

Provide COUNT Python exercises that focus on Exercises.

For each exercise, include:

1. A problem statement requiring the creation of a function.

2. The expected inputs and outputs for the function.

3. Test cases to verify the function's correctness.

4. Helpful hints to solve the problem.

Format each exercise as follows:

## Exercise number: Exercise title

Exercise description and problem statement

**Inputs and Outputs**

- Input: description of input parameters

- Output: description of expected output

**Test Cases**

```python

example test case with input values

# Expected output: expected output

```

**Hints**

1. first hint

2. second hint

...