#define _CRT_SECURE_NO_WARNINGS
#define _USE_MATH_DEFINES
 
#include "bits/stdc++.h"
#include <vector>
#include <set>
#include <string>
#include <queue>
#include <list>
#define REP(i,a,b) for(i=a;i<b;++i)
#define rep(i,n) REP(i,0,n)
#define ll long long
#define ull unsigned ll
typedef long double ld;
#define SQR(X)  ( (X)*(X) )
#define CUBE(X) ( (X)*(X)*(X) )
#define ALL(a) (a).begin(),(a).end()
// #define int ll
 
#define dump(x)  cout << #x << " = " << (x) << endl
using namespace std;
 
bool test = 0;

//...............

signed main(){
  int i,j,k,l;
  int n;
  char s[] = "yukicoder";
  while(cin >> n) {
    if(n == 0) break;
    cout << s[n-1] << endl;
  }
  return 0;
}