"""Create fallback_executor
Generated by Phi-Octopus Eden
2025-11-08 16:49:00.858137
"""

```python
from typing import Callable, Any


class FallbackExecutor:
    """
    A class for creating a fallback mechanism that can be used to recover from errors gracefully.

    Args:
        primary_function: The main function that should be executed.
        backup_functions: A list of functions that will be tried in sequence if the primary function fails.
                          Each function must accept the same arguments as the primary function and return the same type.
    """

    def __init__(self, primary_function: Callable[..., Any], backup_functions: list[Callable[..., Any]]):
        self.primary_function = primary_function
        self.backup_functions = backup_functions

    def execute(self, *args: Any) -> Any:
        """
        Attempts to execute the primary function. If it raises an error, tries each backup function in sequence.

        Args:
            *args: Arguments to be passed to the functions.

        Returns:
            The result of the first successful function call.
        """
        for func in [self.primary_function] + self.backup_functions:
            try:
                return func(*args)
            except Exception as e:
                print(f"Error occurred with {func.__name__}: {str(e)}")
        raise RuntimeError("All functions failed.")


# Example usage
def multiply(a: int, b: int) -> int:
    """Multiply two integers."""
    return a * b


def add(a: int, b: int) -> int:
    """Add two integers."""
    return a + b


def main():
    fallback_executor = FallbackExecutor(
        primary_function=multiply,
        backup_functions=[add]
    )

    # Test with valid inputs
    result = fallback_executor.execute(4, 5)
    print(f"Result (valid input): {result}")  # Expected: Result (valid input): 20

    # Test with invalid input for the primary function
    try:
        result = fallback_executor.execute('4', '5')
    except Exception as e:
        print(e)  # Expected: Error occurred with multiply: unsupported operand type(s) for *: 'str' and 'str'


if __name__ == "__main__":
    main()
```

This code defines a `FallbackExecutor` class that encapsulates error recovery logic by attempting to execute the primary function, and if it fails, tries each backup function in sequence. The example usage demonstrates how to use this class with two simple functions: multiplication and addition.