Why is it invalid syntax for if-statement according to Python interpreter

I've been learning how to program in Python. I've written a program with Python. But when I run it in the terminal (Linux Ubuntu, Python3), the Python interpreter indicates that if power>2 is "invalid syntax". What is going on? The part below is an extract from my entire program.

x1=int(input('Enter an interger '))
x2=int(input('Enter an interger '))
x3=int(input('Enter an interger '))
power=int(input('Enter an interger ')

if power>2:
    print('No')
elif power<2:
    print('Yes')
else:
    print('OK')