Safe invoice total

Problem

The input is JSON text for an invoice: an object with a key items, a list of objects with price and qty. Print the total of price times quantity with 2 decimals. If the text is not valid JSON, print Invalid JSON. If the key items is missing, print No items.

Input, output and limits

Input: One line of text, which may or may not be valid JSON.
Output: The total with 2 decimals, Invalid JSON, or No items.
Constraints: The line is at most 1000 characters

Examples

Example 1

Input

{"items":[{"price":250,"qty":2},{"price":99.5,"qty":1}]}

Output

599.50

500 + 99.5.

Example 2

Input

{oops

Output

Invalid JSON

Not valid JSON.

Hints

Try the problem first. Open one hint at a time.

Hint 1

Wrap json.loads in try and catch json.JSONDecodeError.

Hint 2

Use data.get("items") or test "items" in data before using the list.

Write your Python code, run it on the examples and submit it to hidden tests.

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Input, output and limits

Examples

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Examples

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