#include <bits/stdc++.h>
using namespace std;
char s[10][10] = {"vaporeon", "jolteon", "flareon", "espeon",
                  "umbreon",  "leafeon", "glaceon", "sylveon"};
char t[10];
int main() {
  int n;
  scanf("%d%s", &n, t);
  for (int i = 0; i < 8; i++) {
    int len = strlen(s[i]);
    if (n == len) {
      bool ok = 1;
      for (int j = 0; j < len; j++) {
        if (t[j] != '.' && s[i][j] != t[j]) {
          ok = 0;
          break;
        }
      }
      if (ok) {
        puts(s[i]);
        break;
      }
    }
  }
  return 0;
}
