input: Write a python function to sum two numbers and print the result.
  assert sum_two_numbers(5, 3) == 'Sum of 5 and 3 is 8'
  assert sum_two_numbers(10, 20) == 'Sum of 10 and 20 is 30'
  assert sum_two_numbers(-1, 1) == 'Sum of -1 and 1 is 0'
output: def sum_two_numbers(a, b):
      result = a + b
      return f'Sum of {a} and {b} is {result}'