#include using namespace std; #define fst(t) std::get<0>(t) #define snd(t) std::get<1>(t) #define thd(t) std::get<2>(t) #define unless(p) if(!(p)) #define until(p) while(!(p)) using ll = long long; using P = std::tuple; const int dx[8] = {-1, 1, 0, 0, -1, -1, 1, 1}, dy[8] = {0, 0, -1, 1, -1, 1, -1, 1}; ll N; vector v; int main(){ std::cin.tie(nullptr); std::ios::sync_with_stdio(false); std::cin >> N; while(N >= 0){ v.emplace_back((char)('A' + N % 26)); N /= 26; --N; } reverse(v.begin(), v.end()); for(const auto &c : v){ std::cout << c; } std::cout << std::endl; }