output_description: Print the answer to Roger's question as a string consisting of lowercase
  English letters.
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      N
attempt: #!/usr/bin/env python3
  # -*- coding: utf-8 -*-
  """
  Created on Sun Jun 21 21:17:02 2020
  
  @author: akinari
  """
  
  
  N = int(input())
  
  if N <= 26:  # 1
      ans = chr(N + 96)
  
  elif N <= 26**2 + 26:  # 2
      N2 = int(N / 26)
      N1 = N % 26
      ans = chr(N2 + 96) + chr(N1 + 96)
  
  elif N <= 26**3 + 26**2 + 26:  # 3
      N3 = int(N / 26**2)
      N2 = int((N - 26**2 * N3) / 26)
      N1 = N % 26
      ans = chr(N3 + 96) + chr(N2 + 96) + chr(N1 + 96)
  
  elif N <= 26**4 + 26**3 + 26**2 * 26:  # 4
      N4 = int(N / 26**3)
      N3 = int((N - 26**3 * N4) / 26**2)
      N2 = int((N - 26**3 * N4 - 26**2 * N3) / 26)
      N1 = N % 26
      ans = chr(N4 + 96) + chr(N3 + 96) + chr(N2 + 96) + chr(N1 + 96)
  
  elif N <= 26**5 + 26**4 + 26**3 + 26**2 * 26:
      N5 = int(N / 26**4)
      N4 = int((N - 26**4 * N5) / 26**3)
      N3 = int((N - 26**4 * N5 - 26**3 * N4) / 26**2)
      N2 = int((N - 26**4 * N5 - 26**3 * N4 - 26**2 * N3) / 26)
      N1 = N % 26
      ans = chr(N5 + 96) + chr(N4 + 96) + chr(N3 + 96) + chr(N2 + 96) + chr(N1 + 96)
  
  elif N <= 26**6 + 26**5 + 26**4 + 26**3 + 26**2 * 26:
      N6 = int(N / 26**5)
      N5 = int((N - 26**5 * N6) / 26**4)
      N4 = int((N - 26**5 * N6 - 26**4 * N5) / 26**3)
      N3 = int((N - 26**5 * N6 - 26**4 * N5 - 26**3 * N4) / 26**2)
      N2 = int((N - 26**5 * N6 - 26**4 * N5 - 26**3 * N4 - 26**2 * N3) / 26)
      N1 = N % 26
      ans = (
          chr(N6 + 96)
          + chr(N5 + 96)
          + chr(N4 + 96)
          + chr(N3 + 96)
          + chr(N2 + 96)
          + chr(N1 + 96)
      )
  
  elif N <= 26**7 + 26**6 + 26**5 + 26**4 + 26**3 + 26**2 * 26:
      N7 = int(N / 26**6)
      N6 = int((N - 26**6 * N6) / 26**5)
      N5 = int((N - 26**6 * N6 - 26**5 * N6) / 26**4)
      N4 = int((N - 26**6 * N6 - 26**5 * N6 - 26**4 * N5) / 26**3)
      N3 = int((N - 26**6 * N6 - 26**5 * N6 - 26**4 * N5 - 26**3 * N4) / 26**2)
      N2 = int((N - 26**6 * N6 - 26**5 * N6 - 26**4 * N5 - 26**3 * N4 - 26**2 * N3) / 26)
      N1 = N % 26
      ans = (
          chr(N6 + 96)
          + chr(N6 + 96)
          + chr(N5 + 96)
          + chr(N4 + 96)
          + chr(N3 + 96)
          + chr(N2 + 96)
          + chr(N1 + 96)
      )
  
  print(ans)
  
problem_description: Statement
  
  1000000000000001 dogs suddenly appeared under the roof of Roger's house, all
  of which he decided to keep. The dogs had been numbered 1 through
  1000000000000001, but he gave them new names, as follows:
  
    * the dogs numbered 1,2,\cdots,26 were respectively given the names `a`, `b`, ..., `z`;
    * the dogs numbered 27,28,29,\cdots,701,702  were respectively given the names `aa`, `ab`, `ac`, ..., `zy`, `zz`;
    * the dogs numbered 703,704,705,\cdots,18277,18278  were respectively given the names `aaa`, `aab`, `aac`, ..., `zzy`, `zzz`;
    * the dogs numbered 18279,18280,18281,\cdots,475253,475254  were respectively given the names `aaaa`, `aaab`, `aaac`, ..., `zzzy`, `zzzz`;
    * the dogs numbered 475255,475256,\cdots  were respectively given the names `aaaaa`, `aaaab`, ...;
    * and so on.
  
  To sum it up, the dogs numbered 1, 2, \cdots were respectively given the
  following names:
  
  `a`, `b`, ..., `z`, `aa`, `ab`, ..., `az`, `ba`, `bb`, ..., `bz`, ..., `za`,
  `zb`, ..., `zz`, `aaa`, `aab`, ..., `aaz`, `aba`, `abb`, ..., `abz`, ...,
  `zzz`, `aaaa`, ...
  
  Now, Roger asks you:
  
  "What is the name for the dog numbered N?"
samples: [{"input": "2", "output": "b\n    \n\n* * *"}, {"input": "27", "output": "aa\n    \n\n* * *"}, {"input": "123456789", "output": "jjddja"}]