New puzzle

[akalai]

def sat(x: str): 
    return ("hello" * 1000).count(x) == 999

Solution hidden below so that other people can try to solve it.

Reveal solution

def sol():
    return "oh"

Please post your solutions to this puzzle in the comments using the following formatting:

<details><summary>Reveal solution</summary>
```python
def sol():
    return "world"  # replace with your solution
```
</details>

[mlb2251]

Reveal solution

def sol():
    return "elloh"  # replace with your solution

[ghost]

Reveal solution

def sol():
    return "ohell"