#include <bits/stdc++.h>
using namespace std;

#define rep(i, n) for (int i = 0; i < (int)(n); i++)

int main() {
  int K;
  cin >> K;
  string S = "NUPC";
  vector<string> T(16);
  rep(i, 1<<4) {
    rep(j, 4) {
      T[i] += S[j];
      if (((i >> j) & 1) == 1) {
	T[i] += T[i];
      }
    }
  }
  sort(T.begin(), T.end());
  cout << T[K-1] << endl;
  return 0;
}