#include <bits/stdc++.h>
int main() {
  const int N = 8;
  std::string pokemons[] = {"vaporeon", "jolteon", "flareon", "espeon",
                            "umbreon",  "leafeon", "glaceon", "sylveon"};
  int n;
  scanf("%d\n", &n);
  std::string hidden;
  std::cin >> hidden;
  std::string output = "";
  for (int p = 0; p < N; p++) {
    std::string current = pokemons[p];
    if (current.size() != n) {
      continue;
    }
    bool possible = 1;
    for (int q = 0; q < n; q++) {
      if (hidden[q] != '.' && hidden[q] != current[q]) {
        possible = 0;
        break;
      }
    }
    if (possible) {
      output = current;
      break;
    }
  }
  std::cout << output << std::endl;
  return 0;
}
