```python
def list_value(step:          if step == "+        return 1
    if step:
        return -1
    return 0):

    
def scan_tally(steps: list)    """
    The list total after each instruction.
    """
    total = 0
    results = []
    for step in steps:
        total += list_value(step)
        results.append(total)
    return results
```