Iterator Class

Lab Python Advanced 30 points

Write a class EvenNumbers(limit) implementing __iter__ and __next__ that produces 0, 2, 4, … up to limit (inclusive) and then raises StopIteration. Print the values on one line, then print them again (create a new iterator).

Input

One integer.

Output

Two identical lines.

Example

Input

Output

0 2 4 6 8 10
0 2 4 6 8 10

Sample input available Sample output available

Editor

Python

Hints

__next__ returns the next value or raises StopIteration.

An iterator is used up once it finishes.

Solution explanation

This is what a for loop does under the hood: call iter(), then next() until StopIteration.

Show solution

class EvenNumbers:
    def __init__(self, limit):
        self.limit = limit
        self.current = 0

    def __iter__(self):
        return self

    def __next__(self):
        if self.current > self.limit:
            raise StopIteration
        value = self.current
        self.current += 2
        return value


limit = int(input())
print(*EvenNumbers(limit))
print(*EvenNumbers(limit))

Output

Answer