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 JavaScript (Node.js 12.16.1) (judge verdict: Wrong Answer)

"use strict";
    
const main = arg => {
    arg = arg.trim().split("\n");
    let N = parseInt(arg[0].split(" ")[0]);
    const alphabets = ["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", "z"];

    let temp = 0;
    let digit = 1;
    
    let list = [1];
    
    while(temp < N) {
        temp += Math.pow(26, digit);
        list.push(temp);
        digit++;
        console.log("temp;" + temp);
        console.log("digit;" + digit);
    }
    
    console.log("list:" + list);
    
    let result = [];
    
    // N = N - 26;
    
    let NC = list[list.length - 1] - list[list.length - 2];
    console.log(NC);
    
    console.log("---------")
    for(let i=1; i<digit; i++) {
        let num = Math.floor(NC / list[list.length - (i+1)]);
        //et num = Math.floor(NC / Math.pow(26, list[list.length - i]));
    
        result.push(alphabets[num]);
        
        NC = NC - (26 * num);
        
        console.log("i:" + i);
        console.log("num:" + num);
        console.log("NC:" + NC);
        console.log("-------------");
    }
    
    console.log(result.join(""));
}
main(require('fs').readFileSync('/dev/stdin', 'utf8'));