input: Write a python function to calculate the sum of squares of three numbers.
  assert sumOfSquares(1, 2, 3) == 14
  assert sumOfSquares(0, 0, 0) == 0
  assert sumOfSquares(-1, -2, -3) == 14
output: def sumOfSquares(a, b, c):
      return a**2 + b**2 + c**2