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 <stdio.h>


int main()
{

    long long a = 0;
    //    int n[101];
    int namae[10000];//名前

    scanf("%lld", &a);

    long long  Amari;
    int i = 0;
    //a = a - 1;//0ひき目を消す
    int flag = 0;

    for (i = 0; a > 0; i++)
    {
        flag++;
        Amari = a % 26;
        a = a / 26;

        namae[i] = (int)Amari+96;
        if (Amari == 0){
            namae[i] = 26 + 96;
            a = a - 1;
        }


    }
    int n;
    int p=0;
    if(flag>1)
        p = 1;
    for (int j = i-p; j >= 0; j--)
    {
        n = namae[j];
        printf("%c",n);
    }


    printf("\n");
}