const string t = "helloworld";
const ll sz_t = t.size();

bool contain(string&s, ll x){
  ll n = s.size();
  rep(i, sz_t){
    if (s[i+x]!=t[i]) {return false;}
  }
  return true;
}

bool imply(string&s, ll x){
  ll n = s.size();
  rep(i, sz_t){
    if (s[i+x] != t[i] && s[i+x] != '?') {return false;}
  }
  rep(i, sz_t){
    if (s[i+x] == '?') s[i+x] = t[i];
  }
  return true;
}

void fill(string&s) {
  for(auto&&x:s) if (x == '?') x = 'a';
}

void solve() {
  ll @n;
  string @s;

  rep(i, (n - sz_t) + 1) {
    if (contain(s, i)) {
      fill(s);
      wt(s);
      return;
    }
  }

  rrep(i, (n - sz_t) + 1) {
    if (imply(s, i)) {
      fill(s);
      wt(s);
      return;
    }
  }

  wt(-1);
}

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