#pragma GCC optimize ( "O3" )
#pragma GCC target ( "avx" )
#include <iostream>
#include <string>
#include <stdio.h>
#include <stdint.h>
#include <cassert>
using namespace std;

using ll = long long;

#define TYPE_OF( VAR ) remove_const<remove_reference<decltype( VAR )>::type >::type
#define UNTIE ios_base::sync_with_stdio( false ); cin.tie( nullptr ) 
#define CEXPR( LL , BOUND , VALUE ) constexpr const LL BOUND = VALUE 
#define CIN( LL , A ) LL A; cin >> A 
#define ASSERT( A , MIN , MAX ) assert( MIN <= A && A <= MAX ) 
#define CIN_ASSERT( A , MIN , MAX ) CIN( TYPE_OF( MAX ) , A ); ASSERT( A , MIN , MAX ) 
#define FOR( VAR , INITIAL , FINAL_PLUS_ONE ) for( TYPE_OF( FINAL_PLUS_ONE ) VAR = INITIAL ; VAR < FINAL_PLUS_ONE ; VAR ++ ) 
#define FOREQ( VAR , INITIAL , FINAL ) for( TYPE_OF( FINAL ) VAR = INITIAL ; VAR <= FINAL ; VAR ++ ) 
#define REPEAT( HOW_MANY_TIMES ) FOR( VARIABLE_FOR_REPEAT , 0 , HOW_MANY_TIMES ) 
#define QUIT return 0 
#define COUT( ANSWER ) cout << ( ANSWER ) << "\n"; 

using uint = unsigned int;

// 入力フォーマットチェック用
// 余分な改行を許さない
#define CHECK_REDUNDANT_INPUT string VARIABLE_FOR_CHECK_REDUNDANT_INPUT = ""; cin >> VARIABLE_FOR_CHECK_REDUNDANT_INPUT; assert( VARIABLE_FOR_CHECK_REDUNDANT_INPUT == "" ); assert( ! cin );
// #define CHECK_REDUNDANT_INPUT string VARIABLE_FOR_CHECK_REDUNDANT_INPUT = ""; getline( cin , VARIABLE_FOR_CHECK_REDUNDANT_INPUT ); assert( VARIABLE_FOR_CHECK_REDUNDANT_INPUT == "" ); assert( ! cin );
// |N| <= BOUNDを満たすNをSから構築
#define STOI( S , N , BOUND ) TYPE_OF( BOUND ) N = 0; { bool VARIABLE_FOR_POSITIVITY_FOR_STOI = true;  assert( S != "" ); if( S.substr( 0 , 1 ) == "-" ){ VARIABLE_FOR_POSITIVITY_FOR_STOI = false; S = S.substr( 1 ); assert( S != "" ); } assert( S.substr( 0 , 1 ) != " " ); while( S == "" ? false : S.substr( 0 , 1 ) != " " ){ assert( N < BOUND / 10 ? true : N == BOUND / 10 && stoi( S.substr( 0 , 1 ) ) <= BOUND % 10 ); N = N * 10 + stoi( S.substr( 0 , 1 ) ); S = S.substr( 1 ); } if( ! VARIABLE_FOR_POSITIVITY_FOR_STOI ){ N *= -1; } if( S != "" ){ S = S.substr( 1 ); } } 
// 1行で入力される変数の個数が適切か確認（半角空白の個数+1を調べる）
#define COUNT_VARIABLE( S , VARIABLE_NUMBER ) { int size = S.size(); int count = 0; for( int i = 0 ; i < size ; i++ ){ if( S.substr( i , 1 ) == " " ){ count++; } } assert( count + 1 == VARIABLE_NUMBER ); } 

int main()
{
  UNTIE;
  CEXPR( int , bound_T , 20 );
  CIN_ASSERT( T , 1 , bound_T );
  CEXPR( uint , bound_N , 1000 );
  int length;
  string helloworld[10] = { "h" , "e" , "l" , "l" , "o" , "w" , "o" , "r" , "l" , "d" };
  string helowrd[7] = { "h" , "e" , "l" , "o" , "w" , "r" , "d" };
  string q = "?";
  string a = "a";
  string c;
  int j_L;
  REPEAT( T ){
    CIN_ASSERT( N , 10 , bound_N );
    CIN( string , S );
    assert( S.size() == N );
    length = 0;
    FOR( i , 0 , N ){
      c = S.substr( i , 1 );
      if( c == helloworld[length] || c == q ){
	length++;
	if( length == 10 ){
	  j_L = i - 10;
	  FOREQ( j , 0 , j_L ){
	    c = S.substr( j , 1 );
	    cout << ( c == q ? a : c );
	  }
	  cout << "helloworld";
	  FOR( j , i + 1 , N ){
	    c = S.substr( j , 1 );
	    cout << ( c == q ? a : c );
	  }
	  cout << "\n";
	  break;
	}
      } else if( length != 0 ){
	FOR( j , 0 , 7 ){
	  if( c == helowrd[j] ){
	    i -= length - 1;
	    break;
	  }
	}
	length = 0;
      }
    }
    if( length != 10 ){
      COUT( -1 );
    }
  }
  CHECK_REDUNDANT_INPUT;
  QUIT;
}