input: Write a python function to print numbers from a to b and their squares.
  assert printNumbers(1, 3) == "1 2 3 \n1 4 9 "
  assert printNumbers(4, 6) == "4 5 6 \n16 25 36 "
  assert printNumbers(2, 2) == "2 \n4 "
output: def printNumbers(a, b):
      numbers = " ".join(str(i) for i in range(a, b+1))
      squares = " ".join(str(i*i) for i in range(a, b+1))
      return f"{numbers} \n{squares} "