input: Write a function to check if two integers are equal. Return True if they are equal, otherwise return False.
  assert check_integers_equal(10, 10) == True
  assert check_integers_equal(5, 6) == False
  assert check_integers_equal(-1, -1) == True
  assert check_integers_equal(0, 1) == False
  assert check_integers_equal(-5, 5) == False
output: def check_integers_equal(a, b):
      return a == b