#include <bits/stdc++.h>
using namespace std;
string names[8] = {"vaporeon", "jolteon", "flareon", "espeon",
                   "umbreon",  "leafeon", "glaceon", "sylveon"};
bool mark[8];
int main() {
  int n;
  cin >> n;
  string s;
  cin >> s;
  memset(mark, 1, 8);
  for (int i = 0; i < s.size(); i++) {
    if (s[i] != '.') {
      for (int j = 0; j < 8; j++) {
        if (mark[j])
          if (s[i] != names[j][i]) mark[j] = false;
      }
    }
  }
  for (int i = 0; i < 8; i++) {
    if (mark[i] && n == names[i].size()) {
      cout << names[i] << endl;
      return 0;
    }
  }
}
