#include <bits/stdc++.h>
using namespace std;
const char* NAMES[] = {"vaporeon", "jolteon", "flareon", "espeon",
                       "umbreon",  "leafeon", "glaceon", "sylveon"};
int N;
char str[100];
int main() {
  cin >> N >> str;
  for (int i = 0; i < 8; i++) {
    if (strlen(NAMES[i]) != N) {
      continue;
    }
    bool good = true;
    for (int j = 0; j < N; j++) {
      if (isalpha(str[j]) && NAMES[i][j] != str[j]) {
        good = false;
        break;
      }
    }
    if (good) {
      cout << NAMES[i] << endl;
      return 0;
    }
  }
}
