#include <bits/stdc++.h>
using namespace std;
int c[8];
int main() {
  int n, i, j, cnt = 0, max1 = 0, index;
  string s[8], a;
  cin >> n;
  s[0] = "vaporeon", s[1] = "jolteon", s[2] = "flareon", s[3] = "espeon";
  s[4] = "umbreon", s[5] = "leafeon", s[6] = "glaceon", s[7] = "sylveon";
  cin >> a;
  for (i = 0; i < 8; i++) {
    cnt = 0;
    if (s[i].size() == n) {
      ++cnt;
      for (j = 0; j < s[i].size(); j++) {
        if (a[j] == s[i][j]) ++cnt;
      }
      c[i] = cnt;
    }
  }
  for (i = 0; i < 8; i++) {
    if (c[i] > max1) {
      max1 = c[i];
      index = i;
    }
  }
  cout << s[index] << endl;
}
