#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  string s;
  cin >> n >> s;
  string l[8] = {"vaporeon", "jolteon", "flareon", "espeon",
                 "umbreon",  "leafeon", "glaceon", "sylveon"};
  for (int i = 0; i < 8; i++) {
    regex r("^" + s + "$");
    if (regex_match(l[i], r)) cout << l[i] << endl;
  }
  return 0;
}
