import re


def find_email(text):
    """
    Extract email from text.

    Parameters
    ----------
        text: str
            Text selected to apply transformation

    Examples:
    ---------
    ```python
    sentence="My gmail is abc99@gmail.com"
    find_email(sentence)
        >>> 'abc99@gmail.com'
    ```
    """
    line = re.findall(r'[\w\.-]+@[\w\.-]+', str(text))
    return ",".join(line)