/* -*- coding: utf-8 -*-
 *
 * 2671.cc:  No.2671 NUPC Decompressor - yukicoder
 */

#include<cstdio>
#include<string>
#include<algorithm>
 
using namespace std;

/* constant */

const int M = 4;
const int MBITS = 1 << M;
const char cs[] = "NUPC";

/* typedef */

/* global variables */

/* subroutines */

string ss[MBITS];

/* main */

int main() {
  for (int bits = 0; bits < MBITS; bits++) {
    for (int i = 0; i < M; i++) {
      ss[bits] += cs[i];
      if ((bits >> i) & 1) ss[bits] += ss[bits];
    }
  }
  sort(ss, ss + MBITS);

  int k;
  scanf("%d", &k), k--;

  puts(ss[k].c_str());
  
  return 0;
}