input: def Fibonacci(n: int) -> int: 
      """Find the nth Fibonacci number. Fibonacci sequence starts with 1, 1, 2, 3, 5, 8, ...
      >>> Fibonacci(1)
      1
      >>> Fibonacci(6)
      8
      >>> Fibonacci(-1)
      "Incorrect input"
      """
      if n < 0: 
          print("Incorrect input") 
      elif n == 0: 
          return 0
      elif n == 1: 
          return 1
      else: 
          return Fibonacci(n-1) + Fibonacci(n-2)
output:     if n < 0: 
          return "Incorrect input"
      elif n == 0: 
          return 0
      elif n == 1: 
          return 1
      else: 
          return Fibonacci(n-1) + Fibonacci(n-2)