const string t = "helloworld";

bool chk(string s, int x) {
  string cmp = s.substr(x, 10);
  rep(i, 10) {
    if (cmp[i] != t[i] && cmp[i] != '?') {
      return false;
    }
  }
  return true;
}

void solve() {
  ll @N;
  string @S;

  bool ok = false;
  string ans(N, 'z');

  rep(i, N - 9) {
    if (chk(S, i)) {
      ok = true;
      string now;
      rep(j, N) {
        if (S[j] == '?') {
          if (j >= i && j < i + 10) {
            now.push_back(t[j - i]);
          } else now.push_back('a');
        } else {
          now.push_back(S[j]);
        }
      }
      if (now < ans) ans = now;
    }
  }

  if (ok) wt(ans);
  else wt(-1);
}

{
  REP(rd_int()) { solve(); }
}