#include <cstdio>
#include <cstdlib>
#include <iostream>
#include <string>
#include <cmath>
#include <algorithm>
#include <vector>
#include <queue>
#include <stack>
#include <map>

using namespace std;



int main(){
    char b[50]="yukicoder";
    int in;
    
    while(1){
        scanf("%d",&in);
        if(in==0)
            break;
        printf("%c\n",b[in-1]);
    }
    
    printf("\n");
    
    return 0;
}