using System;

public class Program

{

    public static void Main()

    {

        for(int i=1;i<=100;i++)

            Console.WriteLine(Excel(i));

    }

    public static string Excel(int col){

        if(col <= 26)

             return Letter(col);

        var front = col/26;

        var back = col%26;

        if(back==0){

            front--;

            back=26;

        }

        return Excel(front)+Letter(back);

    }

    public static string Letter(int col){

        return ((char)('A' + col-1)).ToString();

    }

}