#include <bits/stdc++.h>
using namespace std;
char *pokemon[8] = {"vaporeon", "jolteon", "flareon", "espeon",
                    "umbreon",  "leafeon", "glaceon", "sylveon"};
char test[100];
int main() {
  int N;
  scanf("%d\n", &N);
  for (int i = 0; i < N; i++) test[i] = getchar();
  for (int i = 0; i < 8; i++) {
    if (strlen(pokemon[i]) == N) {
      int j;
      for (j = 0; j < N; j++)
        if (test[j] != '.' && pokemon[i][j] != test[j]) break;
      if (j == N) printf("%s\n", pokemon[i]);
    }
  }
}
