using System; using System.IO; using System.Linq; using System.Text; using System.Collections.Generic; using System.Diagnostics; using System.Numerics; using Enu = System.Linq.Enumerable; class Program { static readonly string Name = "inabameguru"; static readonly string Vowels = "aeiou"; HashSet BadKey = new HashSet(); string Ans = null; public void Solve() { int N = Reader.Int(); var S = Reader.StringArray(N); foreach (var s in S) { long key = 0; foreach (char c in s) key = key * 27 + c - '0'; BadKey.Add(key); } int[] count = new int[26]; foreach (char c in Name) count[c - 'a']++; Rec(0, new StringBuilder(), 0, count); Console.WriteLine(Ans ?? "NO"); } void Rec(int i, StringBuilder s, long key, int[] rem) { if (Ans != null) return; if (i == Name.Length) { if (Vowels.IndexOf(s[s.Length - 1]) >= 0 && !BadKey.Contains(key)) Ans = s.ToString(); return; } for (int c = 0; c < 26; c++) if (rem[c] > 0) { char use = (char)('a' + c); if (Vowels.IndexOf(use) < 0 && s.Length > 0 && Vowels.IndexOf(s[s.Length - 1]) < 0) continue; var next = new StringBuilder(); next.Append(s); next.Append(use); rem[c]--; Rec(i + 1, next, key * 27 + c, rem); rem[c]++; } } } class Entry { static void Main() { new Program().Solve(); } } class Reader { private static TextReader reader = Console.In; private static readonly char[] separator = { ' ' }; private static readonly StringSplitOptions op = StringSplitOptions.RemoveEmptyEntries; private static string[] A = new string[0]; private static int i; private static void Init() { A = new string[0]; } public static void Set(TextReader r) { reader = r; Init(); } public static void Set(string file) { reader = new StreamReader(file); Init(); } public static bool HasNext() { return CheckNext(); } public static string String() { return Next(); } public static int Int() { return int.Parse(Next()); } public static long Long() { return long.Parse(Next()); } public static double Double() { return double.Parse(Next()); } public static int[] IntLine() { return Array.ConvertAll(Split(Line()), int.Parse); } public static int[] IntArray(int N) { return Enu.Range(0, N).Select(i => Int()).ToArray(); } public static int[][] IntTable(int H) { return Enu.Range(0, H).Select(i => IntLine()).ToArray(); } public static string[] StringArray(int N) { return Enu.Range(0, N).Select(i => Line()).ToArray(); } public static string Line() { return reader.ReadLine().Trim(); } private static string[] Split(string s) { return s.Split(separator, op); } private static string Next() { CheckNext(); return A[i++]; } private static bool CheckNext() { if (i < A.Length) return true; string line = reader.ReadLine(); if (line == null) return false; if (line == "") return CheckNext(); A = Split(line); i = 0; return true; } }