def return_something(some_dict)
    return some_dict['very_long_key']['another_very_long_key'] \
        ['the_longest_key']

test_d = {
        'key1': {
            'key2': {
                'key3': 'value1'
            }
        },
        'keya': {
            'keyb': {
                'keyc': 'value2'
            }
        }
    }
def key_gettter(d, key):
    for k in key.split('.'):
        if isinstance(d[k], dict):
            d = d[k]
        else:
            return d[k]
    else:
        raise KeyError(key)
print key_gettter(test_d, 'key1.key2.key3')
print key_gettter(test_d, 'keya.keyb.keyc')
print key_gettter(test_d, 'key1.keyb')

class MyDict(dict):
    
    def __init__(self, value={}):
        self.update(value)
    def __getattr__(self, name):
        
        return self[name]
        
    def __setattr__(self, name, value):
        if isinstance(value, dict):
            value=MyDict(value)
        self[name]=value
           
    
dct=MyDict()
dct.update(yy=56)
dct['zz']=56
dct.aa=98
dct.aa={'F':5, 'G':78}
print dct.aa.F
dct.aa.z={'H':78,'O':90}
print dct.aa.z.O
print dct
s=raw_input()

def return_something(some_dict):
    return (some_dict['very_long_key']
                     ['another_very_long_key']
                     ['the_longest_key'])
def return_something2(some_dict):
    some_meaningful_name = some_dict['very_long_key']
    which_self_documents_code = some_meaningful_name['another_very_long_key']
    return which_self_documents_code['the_longest_key']