def build_sprint(operational_year, operational_quarter, sprint_length, sprint_index):
    """
    Helper function to build Sprint name for JIRA.

    :param String operational_year:
    :param String operational_quarter:
    :param String sprint_length:
    :param String sprint_index:
    :return: Formatted Sprint name
    :rtype: String
    """
    return 'Y%s-Q%s-L%s-S%s' % (
        operational_year, operational_quarter, sprint_length, sprint_index
    )