Task
📝 **Task:** `power(base, exp=2)` returns `base ** exp`. Default `exp = 2` (square).
📋 **Steps:**
1. `def power(base, exp=2):`
2. `return base ** exp`
3. `power(5)` → 25
4. `power(2, 3)` → 8
💡 **Similar example:**
```python
def greet(name, msg="Hi"):
return f"{msg}, {name}!"
print(greet("Anna")) # "Hi, Anna!"
print(greet("Anna", "Hello")) # "Hello, Anna!"
```
🎯 **Expected output:** `25\n8`