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

string t = "NUPC";

int main() {
    vector<string> ans;
    for (int bit = 0; bit < (1 << 4); bit++) {
        string s = "";
        for (int i = 0; i < 4; i++) {
            s += t[i];
            if (bit & (1 << i)) {
                s = s + s;
            }
        }
        ans.push_back(s);
    }
    sort(ans.begin(), ans.end());
    int k;
    cin >> k;
    cout << ans[--k] << endl;
}