import functools


def f(dict1, dict2):
    interKeys = set(dict1.keys()) & set(dict2.keys())
    ans = {}
    def reducer(acc, elem):
        ans[elem] = dict1[elem] + dict2[elem]
    functools.reduce(reducer, interKeys, None)
    return ans

print(f({'a': 1, 'b': 2, 'c': 3, 'd': 4, 'e': 5}, {'a': 1, 'd': 2, 'f': 3, 'g': 4, 'e': 5}))