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