#include <bits/stdc++.h>
using namespace std;
char p[][20] = {"vaporeon", "jolteon", "flareon", "espeon",
                "umbreon",  "leafeon", "glaceon", "sylveon"};
char s[20];
int main() {
  int n, k, i;
  scanf("%d", &n);
  scanf("%s", s);
  for (k = 0; k < 8; k++) {
    int fl = 1;
    for (i = 0; fl && i < n; i++) {
      if (p[k][i] == '\0' || (p[k][i] != s[i] && s[i] != '.')) fl = 0;
    }
    if (fl && p[k][i] == '\0') printf("%s\n", p[k]);
  }
  return 0;
}
