not all arguments converted during string formatting.. NO % variables

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The problem is that you take user input:

x = input()

Now x is a str. So, on this line:

    elif x % 2 == 0: #even

The % operator acts as a string interpolation operator.

>>> mystring = "Here goes a string: %s and here an int: %d" % ('FOO', 88)
>>> print(mystring)
Here goes a string: FOO and here an int: 88
>>>

However, the input you gave does not have a format specifier, thus:

>>> "a string with no format specifier..." % 10
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: not all arguments converted during string formatting
>>>

You need to convert your user input into an int for the % operator to perform the modulo operation.

x = int(input())

Now, it will do what you want:

>>> x = int(input("Gimme an int! "))
Gimme an int! 88
>>> x % 10
8
>>>

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