def greet(name):
    return f"Hello, {name}!"

print(greet("Alice"))


def power(base, exponent=2):
    return base ** exponent

print(power(3))     
print(power(3, 3))   


def sum_all(*numbers):
    total = 0
    for num in numbers:
        total += num
    return total

print(sum_all(1, 2, 3, 4))  

Hello, Alice!
9
27
10