input: Write a function to find the intersection of two sets of integers and return the result. The input consists of two sets, and the output should be the intersection of these two sets.
  assert intersection({1, 2, 3, 4}, {3, 4, 5, 6})=={3, 4}
  assert intersection({5, 6, 7}, {7, 8, 9})=={7}
  assert intersection({10, 20, 30}, {40, 50, 60})==set()
  assert intersection(set(), {1, 2, 3})==set()
  assert intersection({1, 2, 3}, set())==set()
output: def intersection(set1, set2):
      return set1 & set2