Check String Start and End

Write a Python function `check_char(string)` that checks whether the given string starts and ends with the same character. The function should return `"Valid"` if the string starts and ends with the same character, and `"Invalid"` otherwise.

#### Example Usage
```python [main.nopy]
check_char("abba")  # Output: "Valid"
check_char("a")     # Output: "Valid"
check_char("abcd")  # Output: "Invalid"
```

#### Constraints
- The input string will only contain lowercase alphabetic characters (`a-z`).
- The input string will have a length of at least 1.

def check_char(string):
    """
    Check if the given string starts and ends with the same character.

    Args:
    string (str): The input string to check.

    Returns:
    str: "Valid" if the string starts and ends with the same character, "Invalid" otherwise.
    """
    # Implement the function logic here
    pass

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Intermediate strings regex

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