using System;

using System.Linq;              

public class Program

{

    public static void Main()

    {

        string s1="Mahanakorn MUT123";

        Console.WriteLine("{0}",s1);

        Console.WriteLine("Length = {0}",s1.Length);

        Console.WriteLine("Length = {0}",s1.ToUpper());

        Console.WriteLine("Length = {0}",s1.ToLower());

        Console.WriteLine("s1[0] = {0} s1[12] = {1}",s1[0],s1[12],"Ball");

        Console.Write(" Array forward is : ");

        for (int i=0; i<s1.Length; i++)

            Console.Write("{0}",s1[i]);

        Console.WriteLine();

        Console.Write(" Array backward is : ");

        for (int i=s1.Length-1;i>=0; i--)

            Console.Write("{0}",s1[i]);

        Console.WriteLine();

        Console.Write(" Uppercase is ");

        int upper=0;

        for(int i=0; i<s1.Length; i++)

        {

            if(s1[i]>='A' && s1[i]<='Z')

                upper++;

        }

        Console.Write("{0}",upper);

        Console.WriteLine();

        Console.Write(" Lowercase is ");

        int lower=0;

        for(int i=0; i<s1.Length; i++)

        {

            if(s1[i]>='a' && s1[i]<='z')

                lower++;

        }

        Console.Write("{0}",lower);

        Console.WriteLine();

        Console.Write(" Integer is ");

        int integer=0;

        for(int i=0; i<s1.Length; i++)

        {

            if(s1[i]>='0' && s1[i]<='9')

                integer++;

        }

        Console.Write("{0}",integer);

    }

}