#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define rep(i, n) for(int i=0;i<(n);++i)
#define rep1(i, n) for(int i=1;i<=(n);i++)
#define ll long long
using mint = modint998244353;
using P = pair<ll,ll>;
using lb = long double;
using T = tuple<ll, ll, ll>;
#ifdef LOCAL
#  include <debug_print.hpp>
#  define dbg(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
#  define dbg(...) (static_cast<void>(0))
#endif

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