Easy Pandas Solution
\n\n# Code\n\nimport pandas as pd\n\ndef invalid_tweets(tweets: pd.DataFrame) -> pd.DataFrame:\n    df = tweets[tweets[\'content\'].str.len() > 15]\n    df = df
\n\n# Code\n```\nimport pandas as pd\n\ndef invalid_tweets(tweets: pd.DataFrame) -> pd.DataFrame:\n    df = tweets[tweets[\'content\'].str.len() > 15]\n    df = df[[\'tweet_id\']]\n    return df\n```
['Pandas']