Common Gem Elements

Each string describes a rock’s composition, and each character represents an element found in it. The function gem_stones receives a list of strings arr. An element is considered a gem if it appears in every rock at least once. Return the number of such common characters.

Примеры

Ввод

["abcdde", "baccd", "eeabg"]

Вывод

2

Ввод

["abc", "abc", "abc"]

Вывод

3

Ввод

["ab", "cd"]

Вывод

0

Нужно реализовать

def gem_stones(arr: list[str]) -> int:

Common Gem Elements

Примеры

Нужно реализовать

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