using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;
class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static int[][] NArr(long n) => Enumerable.Repeat(0, (int)n).Select(_ => NList).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var t = NN;
        var ans = new string[t];
        for (var u = 0; u < t; ++u)
        {
            var n = NN;
            var s = ReadLine();
            ans[u] = Hello(n, s);
        }
        WriteLine(string.Join("\n", ans));
    }
    static string Hello(int n, string s)
    {
        var list = new List<string>();
        var str = "helloworld";
        for (var i = 0; i + 10 <= s.Length; ++i)
        {
            var flg = true;
            var c = s.ToCharArray();
            for (var j = 0; j < 10; ++j)
            {
                if (c[i + j] == '?') c[i + j] = str[j];
                else if (c[i + j] != str[j])
                {
                    flg = false;
                    break;
                }
            }
            if (!flg) continue;
            for (var j = 0; j < c.Length; ++j)
            {
                if (c[j] == '?') c[j] = 'a';
            }
            list.Add(string.Concat(c));
        }
        if (list.Count == 0)
        {
            return "-1";
        }
        list.Sort();
        return list[0];
    }
}