The function takes a string input and returns the number of characters in the input string spelled out in English.
[CODE]: 
```python
def string_length(input_str):
    num_words = {
        1: "one", 2: "two", 3: "three", 4: "four", 5: "five", 6: "six", 7: "seven", 8: "eight", 9: "nine", 10: "ten"
    }
    length = len(input_str)
    return num_words[length]
```
Now, let's test even more inputs to see the function behavior.

COMMAND: PYTHON(./temp/function.py "python" "example" "test123" "qwerty")