Performing mathematical operations on values from two dictionaries with same keys in Python

I have two dictionaries named as, lets say, a = {'A':{2021:45.65},'B':{2021:56.34}} and b = {'A':{2021:78.67},'B':{2021:87.54}}

I want to get the values from both A and B ‘sub-dictionaries’ and compute what percentage of value from the second dictionary is the value from the first dictionary.

I can’t seem to figure out a way how to access both the float values from different dictionaries and compute the result.

————————–UPDATE————————

Apologies about not comprehending my problem in a proper manner. I figured out a way to do that and if you think it has an issue still please do mention.

dict_keys = ['A','B']
for x in dict_keys:
   val1 = a[x].values()
   val2 = b[x].values()

>Solution :

As has been mentioned in some of the comments breaking this into logical parts/steps can help a lot.

//pseudocode
if the len of a == len of b:
    for key, value in a:
        if the len of a[key] == len of b[key]:
            for key, value in a[key]:
                more_less = a's key's value divided by b's key's value

Write it out, if you get an error, post it and I will post help / more code. I will also edit this with proper code after OP gets this figured out, so please don’t downvote this in the meantime. I am doing this for OP and will make an evergreen version for anyone reading this down the line. Thanks.