Type Hints

Lab Python Intermediate 20 points

Write def word_lengths(words: list[str]) -> dict[str, int] and def longest(lengths: dict[str, int]) -> str | None (returns None for an empty dict). Read words (or - for none), print the dict and the longest word.

Input

One line of words, or -.

Output

Two lines.

Example

Input

red yellow blue

Output

{'red': 3, 'yellow': 6, 'blue': 4}
yellow

Sample input available Sample output available

Editor

Python

Hints

Type hints document intent; Python doesn't enforce them at runtime.

str | None means "a string or None".

Solution explanation

Tools like mypy and your editor use hints to catch bugs before the code runs.

Show solution

def word_lengths(words: list[str]) -> dict[str, int]:
    return {w: len(w) for w in words}


def longest(lengths: dict[str, int]) -> str | None:
    if not lengths:
        return None
    return max(lengths, key=lengths.get)


line = input()
words = [] if line == "-" else line.split()
lengths = word_lengths(words)
print(lengths)
print(longest(lengths))

Output

Answer