#include using namespace std; typedef pair P; typedef pair> PP; typedef long long ll; const double EPS = 1e-9; const int INF = 1e9; const int MOD = 1e9+7; int dy[] = {0,1,0,-1}; int dx[] = {1,0,-1,0}; int main(void) { string s = "yukicoder"; int n; while(cin >> n, n != 0){ cout << s[n-1] << endl; } return 0; }