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: N = int(input()) - 1
  s = 1
  while 26**s <= N:
      s += 1
  string = ""
  for tst in range(s):
      index = s - 1 - tst
      value = N // (26**index)
      N -= (26**index) * value
      if value == 0:
          string += "a"
      elif value == 1:
          string += "b"
      elif value == 2:
          string += "c"
      elif value == 3:
          string += "d"
      elif value == 4:
          string += "e"
      elif value == 5:
          string += "f"
      elif value == 6:
          string += "g"
      elif value == 7:
          string += "h"
      elif value == 8:
          string += "i"
      elif value == 9:
          string += "j"
      elif value == 10:
          string += "k"
      elif value == 11:
          string += "l"
      elif value == 12:
          string += "m"
      elif value == 13:
          string += "n"
      elif value == 14:
          string += "o"
      elif value == 15:
          string += "p"
      elif value == 16:
          string += "q"
      elif value == 17:
          string += "r"
      elif value == 18:
          string += "s"
      elif value == 19:
          string += "t"
      elif value == 20:
          string += "u"
      elif value == 21:
          string += "v"
      elif value == 22:
          string += "w"
      elif value == 23:
          string += "x"
      elif value == 24:
          string += "y"
      elif value == 25:
          string += "z"
  print(string)
  
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"}]