using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace DataTypes___Lab
{
class Program
{
static void Main(string[] args)
{
int n = int.Parse(Console.ReadLine());
for (int i = 0; i < n; i++)
{
for (int k = 0; k < n; k++)
{
for (int l = 0; l < n; l++)
{
Console.WriteLine("" +
(char)(i + 'a') +
(char)(k + 'a') +
(char)(l + 'a'));
}
}
}
}
}
}
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