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 (GCC 9.2.1) (judge verdict: Wrong Answer)

#include<stdio.h>

int main(void)
{
    int a,b,c,d,e,f;
    long long int n;
    long long int count = 0;
    
    scanf("%d",&n);
    
    if(n < 27)
    {
        printf("%c",n+96);
    }
    
    else if(n > 26 && n < 703)
    {
        n = n-26;
        for(a = 0 ; a < 26 ; a++)
        {
         for(b = 0 ; b < 26 ; b++)
         {
             count += 1;
             if(count == n)
             {
                 printf("%c%c",a+97,b+97);
             }
         }
        }
    }
    else if(702 < n && n < 18279)
    {
        n = n - 702;
        for(a = 0 ; a < 26 ; a++)
        {
            for(b = 0 ; b < 26 ; b++)
            {
                for(c = 0 ; c < 26 ; c++)
                {
                    count += 1;
                    if(count == n)
                    {
                        printf("%c%c%c",a+97,b+97,c+97);
                    }
                }
            }
        }
    }
    else if(18278 < n && n < 475255)
    {
        n = n - 18278;
        for(a = 0 ; a < 26 ; a++)
        {
            for(b = 0 ; b < 26 ; b++)
            {
                for(c = 0 ; c < 26 ; c++)
                {
                    for(d = 0 ; d < 26 ; d++)
                    {
                        count += 1;
                        if(count == n)
                        {
                            printf("%c%c%c%c",a+97,b+97,c+97,d+97);
                        }
                    }
                }
            }
        }
    }
   else if(475254 < n && n < 12356631)
   {
       n = n - 475254;
       for(a = 0 ; a < 26 ; a++)
       {
           for(b = 0 ; b < 26 ; b++)
           {
               for(c = 0 ; c < 26 ; c++)
               {
                   for(d = 0 ; d < 26 ; d++)
                   {
                       for(e = 0 ; e < 26 ; e++)
                       {
                           count += 1;
                           if(count == n)
                           {
                               printf("%c%c%c%c%c",a+97,b+97,c+97,d+97,e+97);
                           }
                       }
                   }
               }
           }
       }
   }
   
   else if(12356630 < n && n < 321272407)
   {
       n = n - 12356630;
       for(a = 0 ; a < 26 ; a++)
       {
           for(b = 0 ; b < 26 ; b++)
           {
               for(c = 0 ; c < 26 ; c++)
               {
                   for(d = 0 ; d < 26 ; d++)
                   {
                       for(e = 0 ; e < 26 ; e++)
                       {
                           for(f = 0 ; f < 26 ; f++)
                           {
                               count += 1 ;
                               if(count == n)
                               {
                                   printf("%c%c%c%c%c%c",a+97,b+97,c+97,d+97,e+97,f+97);
                               }
                           }
                       }
                   }
               }
           }
       }
   }
  
   
    
    return 0;
}