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