def to_upper_case(given: str) -> str:
    """Returns 'given' in upper-case.

    >>> to_upper_case("foo")
    'FOO'
    >>> to_upper_case("Foo")
    'FOO'
    >>> to_upper_case("FOO")
    'FOO'
    >>> to_upper_case(" ") == " "
    True
    """
    return given.upper()