text: #include <iostream>
  using namespace std;
  
  int main() {
      int fav;
      cin >> fav;
  
      if(fav < 26) {
          cout << 'a' << (char)(97 + fav);
      } else {
          string name_tag = "";
          fav += 25;
          while(fav > 25) {
              if(name_tag.back() == 'a') name_tag += 'z';
              else name_tag += 'a';
              fav -= 25;
          }
          char last_one;
          if(name_tag.back() == 'a') {
              last_one = (char)(97+fav);
          } else {
              last_one = (char)(97+25-fav);
          }
  
          name_tag += last_one;
  
          cout << name_tag;
      }
  }