input: Write a python function to sum two integers if both are even.
  assert sum_of_two_ints(2, 4) == 6
  assert sum_of_two_ints(6, 8) == 14
  assert sum_of_two_ints(3, 4) == "Wrong input"
output: def sum_of_two_ints(a, b):
      if a % 2 == 0 and b % 2 == 0:
          return a + b
      else:
          return "Wrong input"