def stepALCAPRODUCER(skims):
    """
    _stepALCAPRODUCER_

    Creates and returns the configuration string for the ALCAPRODUCER step
    starting from the list of AlcaReco path to be run.

    """

    step = ''
    if len(skims) >0:
        step = ',ALCAPRODUCER:'+('+'.join(skims))
    return step