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 C++ (Clang 10.0.0) (judge verdict: Wrong Answer)

#include <iostream>
#include <list>
using namespace std;
int main()
{
    unsigned long N;
    cin >> N;

    string abc = "abcdefghijklmnopqrstuvwxyz";
    int sinsu = 26;


    //list<int> il;
    string outs = "";

    /*outs = outs + abc[0];
    cout << outs;*/
    //cout << 27 / 27;

    while (N > sinsu) {
        ////il.push_front(a % sinsu);
        //cout << "while a : " << a << endl;
        //cout << "while alfa : " << abc[(a % sinsu)] << endl;
        outs = abc[(N % sinsu) - 1] + outs;
        N = N / sinsu;
    }
    ////il.push_front(a);
    //cout << "while end a: " << a << endl;
    outs = abc[N - 1] + outs;

    //cout << "owari majika" << endl;

    cout << outs;

    return 0;
}