#include <bits/stdc++.h>
using namespace std;
template<typename Ostream, typename Cont>
typename enable_if<is_same<Ostream, ostream>::value, Ostream&>::type operator<<(Ostream& os,  const Cont& v){
  os << "[ ";
	for(auto &x : v)
    os << x << ' ';
	return os << "]";
}
template<typename Ostream, typename ...Ts>
Ostream& operator << (Ostream &os, const pair<Ts...> &p){
  return os << "{" << p.first << ", " << p.second << "}";
}
void dbg_cerr() { cerr << "\e[0m\n"; }
template<typename Head, typename... Tail> void dbg_cerr(Head H, Tail... T) { cerr << ' ' << H; dbg_cerr(T...); }
#ifdef LTF
#define DEBUG(...) cerr << "\e[1;31m[" #__VA_ARGS__ "]:", dbg_cerr(__VA_ARGS__)
#else
#define DEBUG(...)
#endif

void Solve() {
	int K; cin >> K;
	vector<string> s;
	string nupc = "NUPC";
	constexpr int kC = 4;
	for (int mask = 0; mask < (1 << kC); mask++) {
		string cur = "";
		for (int i = 0; i < kC; i++) {
			cur.push_back(nupc[i]);
			if (mask >> i & 1) cur += cur;
		}
		s.push_back(cur);
	}
	sort(s.begin(), s.end());
	cout << s[K - 1] << '\n';
}

int main() {
  ios_base::sync_with_stdio(false); cin.tie(nullptr);
  int T = 1;
  // cin >> T;
  while (T--) {
    Solve();
  }
  return 0;
}