"""677. Map Sum Pairs"""

class MapSum(object):

    def __init__(self):
        """
        Initialize your data structure here.
        """
        

    def insert(self, key, val):
        """
        :type key: str
        :type val: int
        :rtype: None
        """


    def sum(self, prefix):
        """
        :type prefix: str
        :rtype: int
        """
