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 Kotlin (1.3.71) (judge verdict: Wrong Answer)

import kotlin.math.*
fun main(args: Array<String>) {
  	var N = readLine()!!.toLong()
    
    var name = ""
    
    while (N > 0) {
        val a = N % 26
        name = returnAlphabet(a.toInt()) + name
        N -= a
        N = N / 26
    }
    
    println(name)
}

fun returnAlphabet(value: Int): String {
    var alphabet = when(value) {
        1 -> "a"
        2 -> "b"
        3 -> "c"
        4 -> "d"
        5 -> "e"
        6 -> "f"
        7 -> "g"
        8 -> "h"
        9 -> "i"
        10 -> "j"
        11 -> "k"
        12 -> "l"
        13 -> "m"
        14 -> "n"
        15 -> "o"
        16 -> "p"
        17 -> "q"
        18 -> "r"
        19 -> "s"
        20 -> "t"
        21 -> "u"
        22 -> "v"
        23 -> "w"
        24 -> "x"
        25 -> "y"
        26 -> "z"
        else -> "none"
    }
    
    return alphabet
}