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Longest Word Length

Write a Python function `len_longest_word(words)` that takes a list of strings `words` and returns the length of the longest word in the list.

#### Example Usage:
```python [main.nopy]
print(len_longest_word(["python", "PHP", "bigdata"]))  # Output: 7
print(len_longest_word(["a", "ab", "abc"]))          # Output: 3
print(len_longest_word(["small", "big", "tall"]))    # Output: 5
```

#### Constraints:
- The input list will contain at least one string.
- All elements in the list are non-empty strings.
def len_longest_word(words):
    """
    Find the length of the longest word in the list.

    Args:
        words (list of str): A list of strings.

    Returns:
        int: The length of the longest word.
    """
    # Placeholder for the solution
    pass
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