Keep First Characters

Sometimes you need to remove repeats while keeping the original order of the data. The function delete_reoccurring_characters receives a string s. Walk through it from left to right and keep only the first appearance of each character. Skip every later occurrence of a character you have already seen.

Примеры

Ввод

["aaabcccc"]

Вывод

"abc"

Ввод

["abcabc"]

Вывод

"abc"

Ввод

["hello"]

Вывод

"helo"

Нужно реализовать

def delete_reoccurring_characters(s: str) -> str:

Keep First Characters

Примеры

Нужно реализовать

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