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: Accepted)



   #include <bits/stdc++.h>
   using namespace std;
   int main()
   {
      //    string in;
      //  getline(cin,in);
      //  cout<<in;
      //  int t;
      //  cin >> t;
      //  while (t--)
      //  {
         long long num;
         string str;
         cin >> num;

         char temp;
         while (num > 0)
         {
               temp = num % 26;
               if (temp == 0)
               {
                  if (num / 26 != 0)
                  {
                     str.push_back('z');
                     num--;
                  }
               }
               else
               {
                  temp = temp + 96;
                  str.push_back(temp);
                  //cout<<temp;
               }
               temp = 0;
               num /= 26;
         }

         reverse(str.begin(), str.end());
         cout << str << endl;
         
      //  }
   }