#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<long long> VL;
typedef vector<VL> VVL;
typedef long long LL;
#define all(a) (a).begin(), (a).end()
#define Yes(n) cout << ((n) ? "Yes" : "No"  ) << endl
#define ALL(a)  (a).begin(),(a).end()


#include <atcoder/modint>
using mint = atcoder::modint998244353;


int main() {
  string s="NUPC";
  set<string> S;
  rep(ii,16){
    string t;
    int i=ii;
    rep(j,4){
      t+=s[j];
      if(i%2==1){t=t+t;}
      i/=2;
    }
    S.insert(t);
    //cout<<t<<endl;
  }
  int cou;cin>>cou;
  for(auto it : S){
    cou--;
    if(cou==0){cout<<it<<endl;break;}
  }
}