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 n = NN;
        var ans = new string[n];
        for (var i = 0; i < n; ++i)
        {
            var c = new char[6];
            c[0] = 'a';
            var tmp = i;
            for (var j = 1; j < 5; ++j)
            {
                c[j] = (char)(tmp % 26 + 'a');
                tmp >>= 26;
            }
            if (i + 1 < n) c[5] = 'a';
            else c[5] = 'n';
            ans[i] = string.Concat(c);
        }
        WriteLine(string.Join("\n", ans));
    }
}