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Find Last Digit

Write a Python function `last_digit(n)` that takes an integer `n` as input and returns the last digit of the number. The function should handle both positive and negative integers.

#### Example Usage
```python [main.nopy]
print(last_digit(123))  # Output: 3
print(last_digit(-25))  # Output: 5
print(last_digit(0))    # Output: 0
```

#### Constraints
- The input `n` will always be an integer.
- The function should return a single integer representing the last digit of `n`.
def last_digit(n):
    """
    Returns the last digit of the given integer n.

    Args:
    n (int): The input integer.

    Returns:
    int: The last digit of n.
    """
    # Your code here
    pass
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