Mbpp/594

def diff_even_odd(lst):
    """
    Find the difference between the first even and first odd number in the list.
    The difference is calculated as (first even) - (first odd).
    
    Args:
        lst (list of int): Input list of integers.
        
    Returns:
        int: The difference between the first even and first odd number.
        
    Raises:
        ValueError: If the list does not contain at least one even and one odd number.
    """
    first_even = None
    first_odd = None
    
    for num in lst:
        if first_even is None and num % 2 == 0:
            first_even = num
        if first_odd is None and num % 2 != 0:
            first_odd = num
        if first_even is not None and first_odd is not None:
            break
            
    if first_even is None or first_odd is None:
        raise ValueError("List must contain at least one even and one odd number.")
        
    return first_even - first_odd

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