#include <bits/stdc++.h>
using namespace std;
string e[] = {"vaporeon", "jolteon", "flareon", "espeon",
              "umbreon",  "leafeon", "glaceon", "sylveon"};
int cnt[11];
int main() {
  int n, id, ans = 0;
  string s;
  cin >> n >> s;
  for (int i = 0; i < 8; i++)
    if (e[i].size() == n) cnt[i]++;
  for (int i = 0; i < n; i++)
    for (int j = 0; j < 8; j++)
      if (e[j].size() >= i && s[i] == e[j][i]) cnt[j]++;
  for (int i = 0; i < 8; i++)
    if (cnt[i] > ans) ans = cnt[i], id = i;
  cout << e[id] << endl;
  return 0;
}
