title: Python 3.3 NameError
body: <pre><code>&gt;&gt;&gt; a=int(input())
  
  2
  
  &gt;&gt;&gt; b=int(input())
  
  4
  
  &gt;&gt;&gt; c=input()
  
  r
  
  &gt;&gt;&gt; if c==r:
  
      print(b+1)
  
  
  Traceback (most recent call last):
    File "&lt;pyshell#5&gt;", line 1, in &lt;module&gt;
      if c==r:
  NameError: name 'r' is not defined
  </code></pre>