def compose(shift, org):
    """
    Compose the new string correspond to org.

    :param shift: int, shift > 0. How many span needed to be shifted
    :param org:str, original string
    :return: new, str
    """
    frag_1 = org[:len(org)-shift]
    frag_2 = org[len(org)-shift:]
    new = frag_2 + frag_1
    return new