#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf32 1000000001
#define Inf64 1000000000000000001

int main(){
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	
	vector<string> s;
	string t = "NUPC";
	rep(i,1<<4){
		string cur = "";
		rep(j,4){
			cur += t[j];
			if((i>>j)&1)cur += cur;
		}
		s.push_back(cur);
	}
	sort(s.begin(),s.end());
	int K;cin>>K;
	cout<<s[K-1]<<endl;
	
	return 0;
}