[Python] Get list of all sub-keys from a dictionary

I have some dictionaries(json output). I want to get the base element which can be a list of strings or a string. Currently I am doing it like this:-

folder="shared/"
files=os.listdir('shared')


for f in files:
f=folder+f
print(f)
with open(f) as f:
data = json.load(f)
#data is a dict now with sub-keys
for key,value in data.items():
if value.keys():
print(value)
break


This is the input dictionary that was read by the python code:-

{
"shortshirt": {
"ralphlauren": {
"classic": [
"That Ralph Lauren classic fit is a timeless look!",
"Nice choice. Can’t go wrong with Ralph Lauren"
]
}
},
"socks": {
"": {
"": ["Have to find the right socks to keep your feet cozy"]
}
}
}


And this is the output that I am getting:-

{'ralphlauren': {'classic': ['That Ralph Lauren classic fit is a timeless look!', 'Nice choice. Can’t go wrong with Ralph Lauren']}}
{'': {'': ['Have to find the right socks to keep your feet cozy']}}


But this is what I want:-

keys=[["shortshirt","ralphlauren","classic"],["socks"]]

value=[['That Ralph Lauren classic fit is a timeless look!', 'Nice choice. Can’t go wrong with Ralph Lauren'], ['Have to find the right socks to keep your feet cozy']]


But I don't know whether to have 2 or 3 level nested loops. If I have an inner loop and in actual there was no nested key then I get the value error. I want to get all the nested keys in a separate list and the base value or values like on the lowest level in another list, any help regarding this will be highly appreciated.

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