#include <iostream>
#include <string>
using namespace std;
int main(void) {
	string s = "yukicoder";
	int n = 1;
	string ans = "";
	while (n != 0) {
		cin >> n;
		if (n != 0) {
			ans += s[n - 1];
		}
	}
	for (int i = 0; i < ans.size(); ++i) {
		cout << ans[i] << endl;
	}
	if (ans.empty()) cout << endl;
	return 0;
}