Mbpp/784

def mul_even_odd(lst):
    """
    Returns the product of the first even and the first odd number in the list.
    Assumes the list contains at least one even and one odd number.
    """
    first_even = None
    first_odd = None
    
    for num in lst:
        if num % 2 == 0:
            if first_even is None:
                first_even = num
        else:
            if first_odd is None:
                first_odd = num
        
        # Stop early if both have been found
        if first_even is not None and first_odd is not None:
            break
            
    return first_even * first_odd

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