def joinedList(n):

"""

# n : positive integer

# It returns the list [1,2,3,...,n-1, n, n, n-1, ...., 3,2,1]

>>> joinedList(5)

[1, 2, 3, 4, 5, 5, 4, 3, 2, 1]

>>> joinedList('5')

'Invalid input'

>>> joinedList(6.15)

'Invalid input'

>>> joinedList([2,8,[9]])

'Invalid input'

>>> joinedList(3)

[1, 2, 3, 3, 2, 1]

>>> joinedList(0)

[0]

"""

# --- YOU CODE STARTS HERE

# --- CODE ENDS HERE

def removePunctuation(txt):

"""

# txt : string

# It replaces every character that is not an alphabet letter

# into a space, and returns it.

>>> removePunctuation("I like chocolate cake!!(!! It's the best flavor..;.. for real")

'I like chocolate cake It s the best flavor for real'

>>> removePunctuation("Dots...................... many dots..X")

'Dots many dots X'

>>> removePunctuation(55)

'Invalid input'

>>> removePunctuation([3.5,6])

'Invalid input'

"""

# --- YOU CODE STARTS HERE

# --- CODE ENDS HERE