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

template<class T> istream& operator >> (istream& is, vector<T>& vec) {
    for(T& x : vec) is >> x;
    return is;
}

template<class T> ostream& operator << (ostream& os, const vector<T>& vec) {
    if(vec.empty()) return os;
    os << vec[0];
    for(auto it = vec.begin(); ++it != vec.end(); ) os << ' ' << *it;
    return os;
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int K;
    cin >> K;
    string s = "NUPC";
    vector<string> ans;
    for(int i = 0; i < 16; i++){
        string t;
        for(int j = 0; j < 4; j++){
            t += s[j];
            if(i >> j & 1) t += t; 
        }
        ans.push_back(t);
    }
    sort(ans.begin(), ans.end());
    cout << ans[K - 1] << '\n';
}