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: from sys import stdin
  
  n = int(stdin.readline().rstrip())
  
  a = []
  while n // 26 >= 1:
      if n % 26 == 0:
          a.insert(0, 26)
          n = (n - 26) // 26
      else:
          a.insert(0, n % 26)
          n = (n - n % 26) // 26
  if n > 0:
      a.insert(0, n)
  
  i = 1
  while i <= len(a):
      t = a[i - 1]
      if t == 1:
          a[i - 1] = "a"
      elif t == 2:
          a[i - 1] = "b"
      elif t == 3:
          a[i - 1] = "c"
      elif t == 4:
          a[i - 1] = "d"
      elif t == 5:
          a[i - 1] = "e"
      elif t == 6:
          a[i - 1] = "f"
      elif t == 7:
          a[i - 1] = "g"
      elif t == 8:
          a[i - 1] = "h"
      elif t == 9:
          a[i - 1] = "i"
      elif t == 10:
          a[i - 1] = "j"
      elif t == 11:
          a[i - 1] = "k"
      elif t == 12:
          a[i - 1] = "l"
      elif t == 13:
          a[i - 1] = "m"
      elif t == 14:
          a[i - 1] = "n"
      elif t == 15:
          a[i - 1] = "o"
      elif t == 16:
          a[i - 1] = "p"
      elif t == 17:
          a[i - 1] = "q"
      elif t == 18:
          a[i - 1] = "r"
      elif t == 19:
          a[i - 1] = "s"
      elif t == 20:
          a[i - 1] = "t"
      elif t == 21:
          a[i - 1] = "u"
      elif t == 22:
          a[i - 1] = "v"
      elif t == 23:
          a[i - 1] = "w"
      elif t == 24:
          a[i - 1] = "x"
      elif t == 25:
          a[i - 1] = "y"
      elif t == 26:
          a[i - 1] = "z"
      i += 1
  
  print("".join(a))
  
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"}]