#include <bits/stdc++.h>

using namespace std;
using ll = long long;

int main(){
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);

    int N=4, M=1<<4;
    string S="NUPC", T;
    vector<string> v;

    for (int i=0; i<M; i++){
        T = "";
        for (int j=0; j<N; j++){
            T += S[j];
            if (i>>j & 1) T += T;
        }
        v.push_back(T);
    }

    sort(v.begin(), v.end());

    int K;
    cin >> K;
    cout << v[K-1] << endl;

    return 0;
}