def common_vector_root(vec1, vec2):
    """
    Return common root of the two vectors.

    Args:
        vec1 (list/tuple): First vector.
        vec2 (list/tuple): Second vector.

    Usage example::

        >>> common_vector_root([1, 2, 3, 4, 5], [1, 2, 8, 9, 0])
        [1, 2]

    Returns:
        list: Common part of two vectors or blank list.
    """
    root = []
    for v1, v2 in zip(vec1, vec2):
        if v1 == v2:
            root.append(v1)
        else:
            return root

    return root