class LogSystem(object):

    def __init__(self):
        

    def put(self, id, timestamp):
        """
        :type id: int
        :type timestamp: str
        :rtype: void
        """
        

    def retrieve(self, s, e, gra):
        """
        :type s: str
        :type e: str
        :type gra: str
        :rtype: List[int]
        """
        


# Your LogSystem object will be instantiated and called as such:
# obj = LogSystem()
# obj.put(id,timestamp)
# param_2 = obj.retrieve(s,e,gra)
