#include <bits/stdc++.h>
using namespace std;
bool match(string a, string b) {
  for (int i = 0; i < a.size(); i++)
    if (b[i] != '.' && a[i] != b[i]) {
      return false;
    }
  return true;
}
int main() {
  int n;
  string input;
  string op[8] = {"vaporeon", "jolteon", "flareon", "espeon",
                  "umbreon",  "leafeon", "glaceon", "sylveon"};
  cin >> n;
  cin >> input;
  for (int i = 0; i < 8; i++) {
    if (op[i].size() == n) {
      if (match(op[i], input)) {
        cout << op[i] << endl;
        break;
      }
    }
  }
  return 0;
}
