------
## 最终结论
```python
def len_log(words):
    max_length = 0
    for word in words:
        if len(word) > max_length:
            max_length = len(word)
    return max_length

# Test cases
assert len_log(["python","PHP","bigdata"]) == 7
assert len_log(["a","ab","abc"]) == 3
assert len_log(["small","big","tall"]) == 5
```