from typing import Union


def repeated_value(content: Union[str, list, tuple]):
    """Finds the most frequently common value.

    Parameters
    ----------
    content : Union[list, tuple]
        Contains the list/string/tuple's value.

    Returns
    -------
    repeated_value : str
        Returns the Repeated Value.
    """
    if type(content) == str:
        return max(set(list(content)), key=content.count)

    repeated_value = max(set(content), key=content.count)

    return repeated_value