sec-shell-exec

# Task

Implement **`solution.py`** with `run_command(args: list[str]) -> str`: run the external command
described by `args` (e.g. `["ls", "-l"]`) and return its stdout as a string.

```python
# solution.py
import subprocess

def run_command(args: list[str]) -> str:
    """
    Run an external command described by args and return its stdout as a string.
    
    Args:
        args: A list of strings representing the command and its arguments
        
    Returns:
        A string containing the stdout of the command
    """
    result = subprocess.run(args, capture_output=True, text=True)
    return result.stdout
```