Why Input function error?

Recently, i can't use any input function. i don't know why. Anybody could help? Thanks before

First problem:

Code: X=input('number:')

The second one:

Code: X=input('')

Usually, it always work..

Answer 1

[Kevin Phung]

You probably have a variable that you named 'input'

[David Biwono]

I don't.. i only type 1 code (the input function) in 1 line and it comes up with an error