Problem:
Score : 300 points

Problem 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?"

Constraints

N is an integer.

1 \leq N \leq 1000000000000001

Input

Input is given from Standard Input in the following format:

N

Output

Print the answer to Roger's question as a string consisting of lowercase English letters.

Sample Input 1

2

Sample Output 1

b

Sample Input 2

27

Sample Output 2

aa

Sample Input 3

123456789

Sample Output 3

jjddja

Solution in Scala (2.13.1) (judge verdict: Accepted)

object methods {
  def solver(): Unit = {
 
    val tempList: Seq[Seq[String]] = {
      for (line <- io.Source.stdin.getLines()) yield {
        line.split(' ').toSeq
      }
    }.toSeq
    val N: Long = tempList(0)(0).toLong
    val alphaList: List[String] = List("z", "a", "b", "c", "d", "e", "f", "g",
    "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u",
    "v", "w", "x", "y")
 
    val lst = divide(List(N))
    val lstInit = lst.init.reverse
    val lstInitStr: List[String] = lstInit.map(x => alphaList(x.toInt))
 
    println(lstInitStr.mkString)
  }
 
  def divide(nList: List[Long]): List[Long] = {
    val nDivide: Long = nList.last
 
    val rest: Long = nDivide % 26L
    val restList: List[Long] = nList.init :+ rest
 
    val sho: Long = nDivide / 26L
    val shoList: List[Long] = if(rest == 0L) restList :+ (sho - 1L) else restList :+ sho
 
    if(shoList.last == 0L) shoList
    else divide(shoList)
  }
 
}
 
object Main extends App {
  methods.solver
}