#include <bits/stdc++.h>
using namespace std;
string s[8] = {"vaporeon", "jolteon", "flareon", "espeon",
               "umbreon",  "leafeon", "glaceon", "sylveon"};
int f[8] = {0};
int main() {
  string x;
  int n, k;
  scanf("%d", &n);
  cin >> x;
  for (int i = 0; i < 8; i++) {
    if (s[i].size() != n) {
      f[i] = -1;
    } else {
      f[i] = 1;
      for (int j = 0; j < n; j++) {
        if (s[i][j] == x[j]) {
          f[i]++;
        } else if (s[i][j] != x[j] && x[j] != '.') {
          f[i] = -1;
          break;
        }
      }
    }
  }
  for (int i = 0; i < 8; i++) {
    if (f[i] > -1) {
      k = i;
    }
  }
  cout << s[k];
  return 0;
}
