#include<iostream>
#include<iomanip>
#include<string>
#include<algorithm>
#include<vector>
#include<set>
#include<list>
#include<queue>
#include<math.h>
#include<bitset>
using namespace std;

int main(){
    string s = "yukicoder";
    int t;
    cin >> t;
    while (t != 0){
        cout << s[t-1] << endl;
        cin >> t;
    }
}