[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

strings/is_isogram.py

@@ -25,5 +25,3 @@ def is_isogram(string: str) -> bool:
     input_str = input("Enter a string ").strip()
     isogram = is_isogram(input_str)
     print(f"{input_str} is {'an' if isogram else 'not an'} isogram.")
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