#include <bits/stdc++.h>

namespace nono {

void solve() {
    const std::string S = "NUPC";
    std::vector<std::string> vec;
    auto dfs = [&](auto self, int i, std::string s) -> void {
        if (i == 8) {
            vec.push_back(s);
            return;
        }
        if (i % 2 == 0) {
            s.push_back(S[i / 2]);
            self(self, i + 1, s);
        } else {
            self(self, i + 1, s);
            self(self, i + 1, s + s);
        }
    };
    dfs(dfs, 0, "");
    std::ranges::sort(vec);
    int k;
    std::cin >> k;
    std::cout << vec[k - 1] << '\n';
}

}  //  namespace nono

int main() {
    std::cin.tie(0)->sync_with_stdio(0);
    std::cout << std::fixed << std::setprecision(16);
    int t = 1;

    while (t--) nono::solve();
}