HackerRank Python - Set Difference Operation

The tool .difference() returns a set with all the elements from the set that are not in an iterable.
Sometimes the - operator is used in place of the .difference() tool, but it only operates on the set of elements in set.
Set is immutable to the .difference() operation (or the - operation).

  1. # Enter your code here. Read input from STDIN. Print output to STDOUT
  2. e = int(input())
  3. eng = set(map(int,input().split()))
  4. f = int(input())
  5. fre = set(map(int,input().split()))
  6. print(len(eng - fre))

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