using System;

public class Program

{

    public static void Main()

    {

        string[,] table = { 

            {"aa" + "Aaa" } ,

            {

                "bba","bab"};

        };

        foreach (string s in table )

        {

            if (s.Endswith('a'))

        Console.WriteLine(s.Replace('a', 'A'));

    }

​