title: how to get key as words in dictionary?
body: <p>If I have this dictionary how can I do to get the key instead value but reading words.
  Example if I write 2 22 1 response must be A B .</p>
  
  <pre><code>value= {"A": 2, "B": 22, "C": 222, "D": 3, "E": 33,"F":333, "G": 4, "H": 44, "I": 444, "J": 5, "K": 55, "L": 555, "M": 6, "N": 66, "O": 666, "P": 7, "Q": 77, "R": 777, "S": 7777, "T": 8, "U": 88, "V": 888, "W": 9, "X": 99, "Y": 999, "Z": 9999}
  </code></pre>
  
  <p>I was trying with this loop but there´s something wrong:</p>
  
  <pre><code>for i in r:
    key= n[i]
    print key
  </code></pre>