Theory

Counting unique

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Imagine you have information about subjects three students study. It could be in the following format:

Belov = ["Physics", "Math", "Russian"]
Smith = ["Math", "Geometry", "English"]
Sarada = ["Japanese", "Math", "Physics"]

The subjects can be the same or different. Your task is to find the number of unique subjects. For example, in the lists above we have 6 different subjects: Physics, Math, Russian, Geometry, English, and Japanese, so you should print 6 as the answer.

In this task, you're given the variables to work with: Belov, Smith, and Sarada.

Before converting the lists into a set, sum them up as follows Belov + Smith + Sarada.
Write a program in Python 3
# The following code is needed for us to check your answer, do not modify it, please.
students = json.loads(input())
Belov = students['Belov']
Smith = students['Smith']
Sarada = students['Sarada']

# Your code here. Work with the variables 'Belov', 'Smith', and 'Sarada'
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