Write a Python function `remove_length` that removes all words of a specified length `k` from a given string.
#### Function Signature
```python [main.nopy]
def remove_length(input_string: str, k: int) -> str:
```
#### Parameters
- `input_string` (str): The input string containing words separated by spaces.
- `k` (int): The length of words to be removed.
#### Returns
- `str`: A string with all words of length `k` removed.
#### Example Usage
```python [main.nopy]
remove_length("The person is most value tet", 3) # Output: "person is most value"
remove_length("If you told me about this ok", 4) # Output: "If you me about ok"
remove_length("Forces of darkeness is come into the play", 4) # Output: "Forces of darkeness is the"
```